Effects of Therapy at a Community Based Trauma Therapy Service Treating Child Abuse and Neglect: A Pre-Post Study Using Administrative Data

This repeated-measures study examined the effects of a hybrid of Trauma-Focused Cognitive Behavioural Therapy (TF-CBT) with other therapeutic approaches at a community-based clinic in Perth Western Australia among a sample of children and young people overwhelmingly experiencing multiple forms of maltreatment and with complex family situations (i.e., family and domestic violence, parental mental health, parental substance abuse). Drawing on 1713 individual client records from between 2017 and 2020, the researchers identified 113 children and young people with viable pre-post treatment assessments including 78 on the TSCC, 36 on the TSCYC, and 12 on the CBCL. Significant improvements on most clinical scales were identified on the TSCC and TSCYC. Sub-analysis of the TSCC results found no differences across gender, age, care status, therapy funding source, and the presence of sexual abuse in the rate of improvement on trauma symptoms. Overall, the study highlights that integrating different therapy approaches for populations with multiple and complex trauma symptoms accessing community-based services can be useful for supporting the delivery of TF-CBT for difficult to treat populations.


Introduction
The majority of children and young people receiving therapeutic responses for child abuse have experienced multiple forms of maltreatment (e.g., Jensen et al., 2014) which commonly manifest as a complex range of symptoms (e.g., Wolfe et al., 2006).In contrast treatments for children tend to be designed for trauma from single incidents and without complex family dynamics (Cook et al., 2005;Kliethermes et al., 2014).This study draws on data from a community-based clinic in Perth, Western Australia that provided services to children that were predominantly characterised by multiple forms of maltreatment (i.e., sexual abuse, physical abuse, symptoms that manifest in multiple and complex ways (e.g., Wolfe et al., 2006).These children and young people also tend to have ongoing complex family circumstances that can compound their trauma and complicate their treatment (Kisiel et al., 2009).In contrast, current treatments for children tend to be designed for and evidenced around responding to trauma from single incidents or series of events and without complex family dynamics that may compound the symptoms of trauma (Cook et al., 2005;Kliethermes et al., 2014).Indeed, many clinical studies routinely exclude cases with an ongoing risk of domestic violence, parental mental health, and substance abuse (Cohen & Mannarino, 2000).This highlights the difference between the populations included in clinical studies, and populations that present at community-based therapy services (Delorenzi et al., 2016).
Trauma Focused Cognitive Behaviour Therapy (TF-CBT) is a highly researched and well evidenced intervention for children and young people with trauma from abuse and neglect, which is routinely found to outperform clientfocused support treatment conditions in symptom reduction (e.g., Cohen & Mannarino, 1996, 2000).However, much of the evidence for TF-CBT comes from randomised trials that set exclusion criteria that limit the complexity of cases (e.g., exclusions for parental mental health issues, substance abuse, ongoing family and domestic violence).TF-CBT is oriented towards responding to child sexual abuse in isolation from a complex context (e.g., Self-Brown et al., 2016;Celano et al., 2018), with this reflected in the format of the program involving identifying and processing the single most intense trauma (Cohen & Mannarino, 1996).Recognised limitations with TF-CBT in relation to treating Complex Trauma have resulted in the adaption of the treatment protocol to respond to both more intense symptoms and the more complex circumstances of these cases (Cohen et al., 2012).
The recognition of Complex Post-Traumatic Stress Disorder (CPTSD) in diagnostic classifications (e.g., World Health Organization, 2018) has highlighted the potential challenges in treating these disorders, and questions about the applicability of the evidence base for well-established Post-Traumatic Stress Disorder (PTSD) treatments such as TF-CBT (e.g., Maercker et al., 2022).This has prompted adaptations to the existing treatment for PTSD such as extending the total length of treatment and altering the length and intensity of different components within the treatment (Cohen et al., 2012).Consistent with this, researchers running TF-CBT treatment trials with this population have observed the need for a more individualised approach to treatment, building off TF-CBT as a base, but adapting the approach and including additional modules to address additional symptoms (e.g., dysregulation, relational and social difficulties; Hébert & Amédée, 2020).Current expert developed guidelines suggest that the choice, combination and sequence of treatments need to be tailored based on the symptoms and needs of the patient (Bisson et al., 2019).

Treatment Adaption in the Current Study
The current study reports on the treatment effects of a service in Perth, Western Australia delivered by Parkerville Children and Youth Care Inc.known as the Therapeutic Family Service.The service primarily provided TF-CBT (Chan & Herbert, 2022) but compared to the standard treatment model it was typically over a longer period of time and often with many more sessions (Cohen & Mannarino, 1996), even compared to the recommended adaption of TF-CBT for Complex Trauma (Cohen et al., 2012).The practice framework for the service also involved several additional components of treatments to address symptoms identified during the assessment process.In a separate qualitative study of the treatment model (see Chan & Herbert, 2022) clinicians indicated these additional components most commonly included Eye Movement Desensitisation and Reprocessing, Acceptance and Commitment Therapy, Imagery Rescripting, Dyadic Developmental Psychology, Dialectical Behavioural Therapy, Schema Therapy, and others.The matching of additional components to symptoms were determined by the Parkerville clinical team and the Director of Therapeutic & Advocacy Services based on the evidence for the types of treatments associated with addressing individual psychological symptoms.The treatment length was variable and was often affected by the type of program or referral source, with referrals from the multi-agency response and the community-based program having 26 sessions, referrals from the state statutory child protection agency often including services longer than a year, whereas self-referrals typically only included 10 sessions per year under a mental health care plan through Medicare, unless families elected to selffund additional sessions.
The service responded a range of different categories of children that could potentially experience different effects from the treatment1 .In a similar sample Ascienzo et al. (2022) found differences in symptom improvement between male and female poly-traumatised children at different phases of treatment, noting higher scores on some symptoms for females at baseline, PRAC2 skills, and trauma narrative phases, but no difference overall.Given the rates of mid-treatment dropout among referred samples (Herbert, 2021), there is the potential for females to have a higher level of symptoms if the treatment ceased at these earlier phases.Researchers have highlighted less consistent outcomes across studies delivering TF-CBT for younger children (e.g., McGuire et al., 2021), highlighting that some elements of the model assume developmental milestones that younger children may not have reached.Symptom improvement could potentially vary between different referral streams in TFS, particularly as the service included a priority response from a co-located multi-agency investigation team (Herbert & Bromfield, 2020) likely to refer children that had just disclosed, as well as self-referrals and referrals from the state child protection agency.The sample also included children in Out of Home Care, meaning elements of TF-CBT oriented to caregivers had to be adapted for carers (Chan & Herbert, 2022), and be responsive to likely a different scale of trauma and attachment issues.The presence of sexual abuse in the history of children is associated with a different symptom profile (e.g., Stanaway et al., 2018), although as noted it is common in this type of sample to have multiple forms of maltreatment (Jensen et al., 2014).
This study will examine the treatment effects of this therapy framework and examine how different characteristics of trauma symptoms respond to this treatment, and whether different client groups benefited disproportionately from the approach.The research questions include: 1. Does the treatment reduce the symptoms of trauma among a community sample of children and young people who have typically experienced multiple maltreatments and complex presentations of trauma?
2. Are different client characteristics associated with different rates of trauma symptom improvement?

Methods
This study undertook a retrospective pre-post analysis to assess the treatment effects of a community-based therapy oriented towards multiple maltreatment and complex presentations of trauma.The researchers obtained de-identified administrative data from the agency and cases were identified/selected based on valid pre-post applications of the same psychometric instrument to examine the effects of this therapy in a community treatment setting.The study represents an uncontrolled repeated measures design, which has the advantage of more closely representing realistic conditions of therapy but has the limitation of non-standardised assessment schedules and a non-randomised sample.These limitations have been controlled by screening for inclusion and reporting other variations that may have affected the treatment effect (e.g., number of therapy sessions prior to the pre-treatment assessment).For this study a valid pre-post required the instruments to be administered over the same discrete course of treatment (> 6 sessions), as many of the clients had multiple courses of treatment with the same provider.Six sessions was chosen as the minimum number of sessions for a valid treatment as clinicians in the service identified as the number of sessions where a therapist could feasibly work through the minimum required content of the therapy, noting that sessions typically involved a number of rapport building sessions before administering the psychometric instruments (Chan & Herbert, 2022).

Sample
Therapeutic Family Services (TFS) was a directorate within Parkerville that provided psychology services in a community setting in Perth, Western Australia, along with some regional services in the South-West and Wheatbelt regions of Western Australia.The service responded almost exclusively to cases with multiple forms of maltreatment and complex symptoms and circumstances, receiving referrals from a co-located investigative response for child sexual abuse, the organisation's out-of-home care, funded therapy placements from the state statutory child protection agency, a community-based program, and some Medicare and selffunded clients.
This study sought data from the treatment service inclusive of all cases seen between 2017 and 2020 that had an administration of a psychometric instrument on their case record, excluding ongoing cases at the time of the data request (October 2020).While 1713 individual children/ young people were seen in total over the relevant period, the service often did assessments for other programs and did not provide treatment themselves, and many cases only had a single psychometric instrument in the case record completed typically at the time of assessment.
Of the 149 eligible cases extracted (i.e., relevant treatment by Parkerville and at least two administrations of a psychometric instrument), only 113 were found to have a valid pre-post on the same psychometric instrument and have a valid length of treatment (> 6 sessions).This threshold of six sessions was recommended by the clinical team at Parkerville to help distinguish between cases that may have been attending sessions just to undergo assessment as part of being referred to another service.The clinical team also identified that six sessions as part of a discrete block of treatment was the minimum number of sessions to work through enough of the therapy content to plausibly see some improvement in symptoms; noting that usually 2-3 rapport building sessions occurred before any psychometric instruments were completed.All cases were within the expected age range for the program (< 18 years old).To determine likely to have higher pre-treatment assessments inclusive of psychometric instruments which would have increased the likelihood of a similar follow-up assessment towards the end of treatment.While it is preferrable methodologically that a sample is representative of the population, these differences were not unexpected based on the need for the closer monitoring of the symptoms of children in out-of-home care, in complex home situations (i.e., parental mental health concerns), and children with histories of sexual abuse.

Treatment
The treatment provided by Parkerville's specialist psychology service TFS was primarily based on TF-CBT, with most clinicians indicating this was the approach they aligned most closely to (Chan & Herbert, 2022).This multi-modal approach was implemented in recognition of the complex backgrounds and multiple forms of maltreatment experienced by most of the children and young people attending the clinic, consistent with the most up to date understandings of child abuse and neglect (Higgins et al., 2023).The most common therapeutic approaches delivered in the validity the treatment sessions were mapped against the administrations of each of the psychometric instruments to identify whether the pre-post could be mapped to a discrete period of treatment, as many of the cases involved multiple engagements and dis-engagements with therapy.This also resulted in the screening out of some cases where the relevant treatment period for the observation was too short (< 6 sessions).
The final sample was compared against the treatment population the data was drawn from (see Table 1), which identified some significant differences.The analysis found that while the sample was equivalent to the treatment population on most characteristics, the sample had a significantly larger proportion of cases in the care of the CEO (χ 2 (1, n = 1677) = 12.98, p = < 0.004*), cases with parental mental health flagged as a concern (χ 2 (1, n = 1090) = 22.79, p = < 0.004*), and cases with sexual abuse as a concern (χ 2 (1, n = 1090) = 9.04, p = < 0.004*).This reflects that cases with these characteristics were more likely to receive multiple psychometric instruments, especially children in care who were required to have these measures as part of their case reports.Similarly, children with higher complexity were

Client Demographic Data
In addition to the data relating to the pre and post treatment assessments the following client information was collected: • Client age at intake and at each administration of a psychometric instrument.
• If the child is in out-of-home care.
• Referral source and funding for therapy.
• Date of referral, commencement, and end of therapy.
• Living situation at intake and conclusion of therapy.
• Primary abuse type reason for the referral (i.e., witness FDV, physical abuse, sexual abuse) and the presence of other forms of adverse childhood experiences including other forms of abuse in case history (i.e., neglect, parental poor mental health, parental drug and alcohol abuse).
• Number of therapy sessions and dates of therapy sessions.

Procedures
Data was extracted by staff from Parkerville Children and Youth Care Inc.and a data analyst contracted by Parkerville and provided to the research team as part of an administrative data request.Primarily this involved fixed field information from the Parkerville administrative data system being exported into an excel sheet, or information recorded in the database in pdf form being manually copied by coders into the data sheet.
While each of the client fields were populated with information generated by the Parkerville database, the assessment results for each instrument were attached to the database as a pdf with results handwritten in some cases (e.g., with the TSCC and TSCYC).Extraction of results involved two Parkerville staff entering the results of these tests into an excel spreadsheet.These staff undertook 25% double entry across each of the cases to determine the rate at which data entry errors occurred; no discrepancies were identified among the double coded cases.
program included TF-CBT, EMDR, Cognitive Behavioural Therapy, Acceptance and Commitment Therapy, Imagery Rescripting, Dyadic Development Psychology, Dialectical Behaviour Therapy, Scheme Therapy, and Circle of Security (Chan & Herbert, 2022).The treatment approach was determined through formulation in group supervision with the clinical leads and clinical director, applying an informal matrix of treatments matched to symptoms.In a separate study staff noted that the 'Bruce Perry Neuro-sequential Model of Therapeutics' was the model for how they structured their multi-modal treatment approach.

Instruments
The TFS undertook a variety of assessments with clients, although the choice of assessments was up to the individual discretion of the clinician.While intended that psychometric instruments were used at the beginning and ending of treatments, the point at which instruments were used was ultimately determined by the clinicians with their clients; in many cases initial assessments were not completed until the clinician had the opportunity to establish a therapeutic alliance with the client.Similarly, some children suddenly disengaged from therapy making it not possible to complete an end of treatment assessment.
The suite of assessment tools used by TFS are common psychological instruments used for measuring the symptoms of trauma.The administrative data included: The Child Behaviour Checklist (CBCL; n = 28) and accompanying Youth Self Report (YSR; n = 3), the Trauma Symptom Checklist for Children (TSCC; n = 97) or Trauma Symptoms Checklist for Young Children (TSCYC; n = 48), the Beck Youth Inventory (n = 7), Child Revised Impact of Event Scale (CRIES; n = 15), Adolescent Dissociative Events Scale (A-DES; n = 1), Depression Anxiety Stress Scales (DASS; n = 7), and the CBCL 1.5 (n = 1).As many of these instruments had a small number of pre-post administrations, the analysis was restricted to the TSCC and the TSCYC.

TSCC & TSYCC
The TSCC and TSYCC are standardised trauma measures assessing acute and chronic post-traumatic stress and other psychological symptoms associated with trauma.The TSCC is a 54 item self-report instrument for children ages 8-16 years who have experienced a traumatic event (Briere, 1996).TFS clinicians sometimes also used the TSCC-A (44 items), which is the same instrument but without items covering sexual content.Children are asked to indicate whether each of the items occur (0 = never, 1 = sometimes, 2 = lots of times, 3 = almost all of the time) over the last month, across six clinical scales including: Anxiety, Depression, small for meaningful analysis, the paper does not report separate results by race/ethnicity.

Analysis
For both the TSCC and the TSCYC a repeated samples t-test (or an Wilcoxon Signed-Rank Test where the samples were not normally distributed) was used to examine whether a significant difference existed between the pre and post treatment measures.Changes in clinical significance were examined using the McNamar's test, and effect sizes were calculated using Cohen's D. For the TSCC, an independent samples t-test (or an Independent Samples Mann-Whitney U where the samples were not normally distributed) was conducted, using differences between pre and post-tests as the dependent variable, and gender, care status, therapy funding, presence of child sexual abuse, living situation at intake and age categories as independent variables.A Bonferroni adjusted significance level was used to correct for multiple comparisons within each of the scales within the included instruments.
A power analysis conducted with G*Power indicated that the required samples for a repeated samples t-test was 34 to achieve a power of 80% and a level of significance of 5% (two sided), for detecting an effect size of 0.5 between pairs.This means that the comparison of means for the CBCL scales was under powered, while the comparisons for the TSCYC and TSCC were adequately powered.This informed the decision to not include the analysis of results from the CBCL in this paper.For an independent samples t-test the required sample was 64 to achieve a power of 80% and a level of significance of 5% (two sided), for detecting an effect size of 0.5 between groups.This meant that the analyses of how demographic factors influenced the mean differences between pre-post on the TSCC was adequately powered.

Results
Two psychometric instruments (TSCYC and TSCC) were included in the analysis of differences between pre-treatment and post-treatment.Some additional analyses were conducted with the TSCC results as the larger sample size allowed for a comparison of how different demographic factors influenced treatment effects.
As relevant treatment periods were linked to when the eligible pre-post occurred, treatment characteristics are separated by individual instruments (see Table 2); because of the small number of eligible comparisons, the treatment effects from the CBCL have not been reported.As reports were by treatment period and instrument this meant that in Client demographics were obtained for all cases with at least two administrations of the same psychometric instrument.Dates in the demographics were used to generate the following variables: age at first assessment, number of days from referral to commencement of therapy; number of days from commencement to discharge; days between pre and post assessments.As each case included all interactions with the client, these were limited to interactions that counted as in-person therapy sessions (i.e., 'assessment', 'individual contact', 'safety/risk assessment', 'couple/family contact').Limited to the sessions that the client attended, this information was used to generate the number of attended sessions between pre and post, and the number of sessions that occurred before the pre assessment.Particularly for more complex cases, clinicians often spent several sessions building rapport and working to stabilise the child and family before administering the first psychometric instrument.
Several procedures were undertaken to screen the data for eligible pre and post assessments.As many of the children had multiple treatment periods, treatment engagements were mapped to help visualise the relationship between the treatment periods and when the assessments occurred.60 days between sessions was used as the threshold to separate discrete periods of treatment.This helped to highlight where assessments did not reflect pre-post treatment, many of which reflected multiple pre-treatment assessments occurring at the beginning of different treatment periods.Individual tests were also ruled ineligible for the pre-post where less than 6 therapy sessions occurred between the pre-post.This led to 17 CBCL, 19 TSCC, and 12 TSCYC administrations being identified as ineligible for the prepost comparison.

Ethics
The study was approved by the University of South Australia's Human Research Ethics Committee, with organizational approvals from Parkerville's Senior Leadership Group including the Chief Executive and Directors.The study managed potential ethical risks by obtaining only de-identified data, with cases identified by codes that only Parkerville staff could match back to identifying details.All clients receiving services at Parkerville signed a service agreement noting that their data may be used for research or program review.As the participants were children and young people this service agreement was signed by the caregiver/carer and serves as assent for inclusion in the research.While the data obtained were sensitive, the risks to children and families were low due to the use of de-identified data.As a small proportion of the sample were Aboriginal or were from culturally and linguistically diverse communities, too only depression did not also have a significant difference in terms of changes to clinical symptom status.

TSCC Comparison with Demographic Characteristics
The TSCC had a large enough sample to allow for some comparisons of how demographic factors may have influenced improvements on trauma symptoms.These were examined using the difference between pre-post scores as the dependent variable.

Sex
Comparing males and females on differences between pre-post on each of the TSCC scales, no significant differences were identified (see Table 5).Males (m = 0.35; sd = 9.25) on average did not improve as much on the Dissociation -Fantasy scale compared to females (m = 3.64; sd = 11.19),however this difference did not reach significance.some circumstances results could include the same client more than once for the same or even different periods of treatment if an eligible pre-post occurred with more than one instrument.For the TSCC there were an average of 229 days between pre and post tests, with an average of 16 attended sessions between observations.On average there were around 4 attended sessions prior to the pre-test.Results were similar for the TSCYC on days between pre and posttests (m = 241.9;sd = 126.2),number of attended sessions between observations (m = 16.0;sd = 8.9), and number of attended sessions prior to the pre-test (m = 2.9; sd = 4.1).
Across all eligible cases (n = 113) the average time a case was active with the treatment provider was just over a year (m = 422 days: sd = 214 days), although this was based on the length of time a case was open; cases could remain open a long time without activity.There was on average 114 days (sd = 165) between the date of referral and the commencement of therapy.The clinician rated reason for discharge was most commonly 'normal completion' (n = 55; 48.7%), 'discharged' (n = 29; 25.7%), with a smaller number of cases having 'funding ceased' (n = 3; 2.7%), 'mutual agreement to discharge early' (n = 8; 7.1%), 'withdrawal prior to completion' (n = 3; 2.7%), and 'other' (n = 11; 9.7%).

TSCYC Results
Significant improvements were identified between pre and post treatment on TSCYC anxiety (Z = -3.38,p = .001,d = 0.46), depression (t = 3.40, p = .002,d = 0.57), anger/ aggression (t(35) = 4.21, p =.<001, d = 0.70), post-traumatic stress -intrusion (Z = -3.84,p = < 0.001, d = 0.72), posttraumatic stress -arousal (t = 3.94, p = < 0.001, d = 0.62), and post-traumatic stress -total (t = 5.08, p = < 0.001, d = 0.67) scales (see Table 3).All effect sizes were between the 'medium' to 'large' range (Cohen, 1988).No significant differences were identified for post-traumatic stress -avoidance (t = 2.29, p = .028),dissociation (t = 1.96, p = .057),and sexual concerns (Z = -1.32,p = .187).In terms of changes to the presence of clinically significant symptomatology, significant differences were identified for anxiety (0.002), anger/aggression (0.001), post-traumatic stress -intrusion (0.002), post-traumatic stress -arousal (0.001), and posttraumatic stress -total (< 0.001).Among all scales with a significant difference in terms of change on symptom scales, on the PTS scale of the TSCC from a community-based intervention for trauma exposed school age children in Canada, with TF-CBT delivered by a Children's Advocacy Centre.The researchers reported only a small reduction on the PTS scale between 'pre-therapy' and 'post-therapy' measurement points, which are equivalent to the measurement period in the current study (Konanur et al., 2015).Kolko et al. (2011) included children with backgrounds of physical abuse in an adapted version of TF-CBT called Alternatives for Families: A Cognitive Behavioral Therapy (AP-CBT).The current study had slightly higher pre-test means for each scale than Kolko et al. (2011), and similarly had slightly higher mean improvements on symptoms.These differences may be artefacts of the sample in this study, which included referrals from sexual abuse investigations, state funded sexual abuse services, out of home care, and self-referrals, or effectively addressed through the delivery of the hybrid TF-CBT approach, although symptoms related to sexual concerns, and dissociation symptoms among younger children did not appear to be influenced by the treatment.This may have been as on average symptoms were lower on the Dissociation -Fantasy and Sexual Concerns -Pre-Occupation scales for the sample.No significant differences in treatment effect were found across categories the sample was compared on (gender, age, funding source, care status, presence of CSA, living situation at intake).
Overall, the study suggests that supplementing TF-CBT with additional therapeutic approaches may be helpful for children with multiple maltreatments and complex symptoms, but for the service delivering this approach (TFS) additional components that are known to address dissociation and sexual concerns may be required.
Looking to similar community-based treatment studies utilising TF-CBT, this study found much larger improvements than Ruiz (2016) and Konanur et al. (2015), but similar changes on the PTS scale as Kolko et al. (2011).Ruiz (2016) included only a short treatment period (3-months) among a sample of sexually abused children receiving TF-CBT from a community clinic.T1 scores on the TSCC scales were much lower than in the current study, and the treatment effect was smaller on all scales, although significant in the context of this study.Konanur et al. (2015) had a similar baseline of symptoms implemented (Chan & Herbert, 2022) with appropriate fidelity checking.Despite similarly high symptomatology on the sexual concerns and dissociation scales on the TSCC, there appeared to be limited or no improvement on Dissociation -Fantasy, Sexual Concerns, Sexual Concerns -Pre-Occupation scales.This may suggest that the therapy team should explore additional therapies to add into the matrix that more directly address these symptoms.
For other treatment providers responding to similarly diverse and complex populations of children, there appears to be value in a symptom matching approach.Chan and Herbert (2022) covers some of the challenges experienced by the service provider in implementing this approach, namely maintaining training and competency across the clinician team in multiple approaches, managing individual clinician preferences as part of the formulation process, and the intensity of supervision and support needed.
As identified, the case histories of the sample were highly complex, often with multiple engagements and disengagements with therapy.The reasons for disengaging with therapy are complex and there is some evidence to suggest that barriers to engaging may vary considerably between service systems (Herbert, 2021).Further exploration of the patterns of disengagement and their relationship to the characteristics of children/young people may help to design a more effective system of referral and intake that addresses barriers to access (e.g., Budde et al., 2023).Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made.The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material.If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted were selected based on having repeated measures of the same instrument over a continuous treatment period.This meant that the sampled cases disproportionately included some of the more severe cases (both in terms of background and baseline symptoms), which received additional attention from the treatment team and were more likely to have multiple psychometric instruments administered.This limits the ability to extrapolate the findings to the whole treatment population, which on average were less likely to be in care, have parental mental health as a concern and have a background including child sexual abuse.

Acknowledgements
This study drew on data retrospectively, while information could be obtained about the number and frequency of treatment sessions this did not extend to the measurement of treatment fidelity/quality.Chan and Herbert (2022) outlines the treatment approach, however there was no data available to provide assurance of fidelity to the model, or to analyse how fidelity to the model related to treatment outcomes.Future work would ideally link the process of symptom matching and the treatment formulations arrived at with the improvement of symptoms, with the potential to study the effects of different types of formulation among similar symptom profiles.
As observed in the discussion, the pattern of engagement with therapy was complex, with most children having multiple periods of treatment, many of which were not bookended with the administration of a psychometric instrument.While the study reports on the number of therapy sessions that occurred prior to the first measure, this did not capture the multiple periods of contact often with significant gaps between them.These multiple periods of engagement complicate the observation of the treatment effects, for example a child may have engaged with therapy which reduced their symptoms, then reengaged 4 months later and received their first measure of a psychometric instrument.This complexity makes it difficult to draw conclusions based on the number of sessions or treatment length.

Implications
This adapted approach to therapy appears to address the major symptoms of trauma (anxiety, depression, posttraumatic stress, anger, dissociation) among a sample of children predominately presenting with complex trauma responses and complex histories of abuse and neglect.This broadly appears to support the approach of adapting TF-CBT to treat this target group, although a randomised trial would be required to compare this approach against a standard TF-CBT approach.This would also require a more formalised version of the approach to be

Fig. 1
Fig. 1 Diagram of Sample Selection This research was undertaken as part of a Lotterywest grant awarded to Parkerville Children and Youth Care Inc.and the Australian Centre for Child Protection for the Pursuit of Excellence in Responding to Child Abuse and neglect (PERCAN) initiative.Funding Open Access funding enabled and organized by CAUL and its Member Institutions Declarations Conflict of interest The research was completed independent of Parkerville Children and Youth Care Inc., although the organisation provided support in terms of data and advice on data entry.The researchers do not have a financial or employment relationship with Parkerville.

Table 1
Comparison of Treatment Population with Sample

Table 5
Comparison of Symptom Change between Sex (n = 75)