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Systematic Review of Intervention Practices for Depression in the Workplace


Design Systematic Review. Objective To determine which intervention approaches to manage depression in the workplace have been successful and yielded value for employers in developed economies. Data Sources We searched MEDLINE, EMBASE, CINAHL, Central, PsycINFO, and Business Source Premier up to June 2010 using search terms in four broad areas: work setting, depression, intervention, and work outcomes. Study Selection Two independent reviewers selected potential articles that met the following criteria: working age individuals with mild or moderate depression; interventions or programs that were workplace-based or could be implemented and/or facilitated by the employer; inclusion of a comparator group in the analysis; outcomes of prevention, management, and recurrences of work disability or sickness absence, and work functioning. Methods Two reviewers independently reviewed each article for quality and extracted data using standardised forms. Following guidelines from the GRADE Working Group, the quality of evidence addressing each outcome was graded as high, moderate, low, or very low on the basis of six criteria: study design, risk of bias, consistency, generalisability, data precision, and economic benefit. Using this information and following Cochrane Collaboration guidelines, the findings for each intervention were summarised and key messages were developed. Results We identified ten randomised trials and two non-randomised studies from various countries and jurisdictions that evaluated a wide range of intervention practices. The evidence was graded as “very low” for all outcomes identified. Therefore, no intervention could be recommended. Conclusions To date, there is insufficient quality of evidence to determine which interventions are effective and yield value to manage depression in the workplace.


Depression is a widespread, disabling psychiatric illness with far-reaching personal and economic consequences [1, 2]. By the year 2020, depression will be the second largest burdensome illness in developed economies [3]. In addition to its adverse individual effects, the associated workplace effects of depression are extensive. Employees with depression report significantly more health-related lost productive time than those without depression [46], higher rates of absenteeism and short-term disability spells [7], and higher rates of job turnover [8]. Economic analyses have consistently demonstrated that the costs of lost productivity associated with depression far exceed the costs of resources utilised to treat and manage the disorder [9]. Furthermore, depression has been shown to be one of the most costly of common health conditions that affect the ability to work and work (or job) performance [5, 1013].

Not surprisingly, many employers offer Employee Assistance Programs, health promotion or wellness programs, yet employer-sponsored programs that specifically target depression in the workplace remain uncommon [14]. There are information gaps that may prevent employers from making further investments to reduce the impact of depression in the workplace. The most significant gap may be the paucity of readily accessible information on targeted interventions that improve work-related outcomes, such as reducing absenteeism and productivity loss at work [13]. Consequently, we undertook a systematic review to identify evidence-based programs, or intervention approaches that could be implemented or facilitated by employers to manage workers’ depression and reduce associated productivity losses.


The systematic review methods were adapted from a process developed by the Cochrane Collaboration [15]. The review team included 11 researchers from Canada, United States, and Europe from various disciplines. The research question addressed was: “Which intervention approaches to manage depression in the workplace have been successful and yielded value for employers in developed economies?”

Stakeholder Engagement

Two meetings with stakeholders (representing the Ontario Ministry of Health and Long-Term Care, the Ontario Ministry of Government Services, insurance providers, disability management service providers, mental health organisations, mental health disorder survivors, organised labour, and employers) were conducted to solicit input related to the research question, literature search terms, presentation of the findings, messages, and appropriate communication channels.

Criteria for Inclusion of Studies

(P) Population:

Men and/or women of working age (i.e. 18–65 years old) with depression. Depression was defined as “current or remitted depression” identified using one of the following methods: a screening interview or instrument, a clinician-derived diagnosis, a diagnosis established using formal standardised diagnostic criteria, or validated self-report instruments. Studies that included participants with other mental health disorders were included only if 50% or more had depression. Studies were excluded if the focus was on severe mental disorders (i.e., bipolar disorder or schizophrenia, or chronic severe depression that precluded patients from any meaningful labour market participation) and where the primary focus was on persons with alcohol or other substance abuse or dependence disorders, depression related to pregnancy, and depression in military and veterans populations. Studies primarily focused on bereavement, burnout, and anxiety were also excluded.

(I) Intervention:

Studies evaluating programs or interventions that were workplace-based or that could be explicitly implemented and/or facilitated by the employer were included. Workplace or work setting was defined as any location where a worker performs his or her assigned work. Studies of in-patient intervention programs and those focusing entirely on drug treatment of depression were excluded.

(C) Comparison/Control:

Any study with a comparator group was included. This included randomised controlled trials as well as non-randomised studies.

(O) Outcomes:

Work-relevant outcomes included: sickness absence (leave), absenteeism, worker turnover, long-term disability, on-the-job health-related performance, work-functioning (productivity) and injury rates.

The review team considered published or in-press peer-reviewed scientific articles. There were no language restrictions. Book chapters, dissertations, and conference proceedings were excluded.

Search Methods for Identification of Studies

Key terms were identified and combined to search the following databases from their inception dates: MEDLINE, EMBASE, CINAHL, Central, PsycINFO and Business Source Premier up to June 2010. Both database-specific controlled vocabulary terms and keywords were included. The complete list of terms used and the detailed search strategy are presented in Appendix 1—Electronic supplementary material. The reference lists in review articles and articles included were also checked.

Selection of Studies, Risk of Bias Assessment, and Data Extraction

Study selection, risk of bias assessment, and data extraction were conducted independently by two members of the review team in rotating pairs that were randomly selected from the pool of 11 authors. All authors participated in all tasks. Titles, abstracts, and full articles were evaluated to exclude articles that did not meet the inclusion criteria (Appendix 2—Electronic supplementary material). Reviewers entered responses for all levels of review on commercial review software, DistillerSR [16], allowing centralised article tracking and access.

Risk of bias was conducted using a protocol adapted from the Cochrane Collaboration. Responses from 18 quality criteria questions (Appendix 3—Electronic supplementary material) were grouped to form a set of criteria used to judge risk of five biases: (1) selection bias; (2) attrition bias; (3) performance bias; (4) measurement bias; and (5) reporting bias [15]. For each type of bias, the risk was determined to be low, moderate, or high. An article was considered to be overall at high risk for bias if the risk of any one bias type was rated high.

Data were extracted using a standardised data extraction form based on existing forms and data extraction procedures [17, 18]. A classification framework was established to categorise the work-related outcomes reported in the studies of this review into one of four categories, as suggested by stakeholders (see Table 1). Quantitative pooling of results was not possible due to outcome measure heterogeneity, study methods, and lack of data necessary to calculate effect sizes.

Table 1 Framework of work-related outcomes relevant to review stakeholders

Evidence Synthesis

The quality of evidence and strength of recommendations were adapted from the Grading of Recommendations Assessment, Development and Evaluation Working Group [19]. (Appendix 4—Electronic supplementary material) The summary of findings and key messages were developed following published guidelines from the Cochrane Collaboration [15]. For each intervention assessed, the findings corresponding to each work-relevant outcome category were classified as positive, negative, or neutral, depending respectively upon whether the intervention group was statistically significantly better (P < 0.05), worse (P < 0.05) or not different (P ≥ 0.05) from the control group. Key messages for each intervention approach were extracted following the framework shown in Table 2 for those studies employing an inactive control group (e.g., usual care).

Table 2 Translation from summary of findings to key messages


Description of Studies

The search of electronic databases yielded 4,214 articles. After reviewing the titles and abstracts, we identified 293 articles for full-article relevance screening. Following their review, 21 articles proceeded to quality appraisal. Seven additional articles were excluded at the risk of bias assessment and data extraction stages because they did not meet inclusion criteria, resulting in 14 included articles from 12 studies. Figure 1 summarises the study selection process.

Fig. 1
figure 1

Flowchart of studies

Study Characteristics (See Appendix 5—Electronic Supplementary Material)

Of the studies identified, four were conducted in The Netherlands [2024], four in the USA [2529] and one each in Canada, Finland, Denmark, and Japan [3034]. Ten were randomised controlled trials (RCTs) [2029, 3133] and two were non-randomised studies (NRSs) with a separate control group [30, 34]. Studies were conducted in a variety of settings, including workplaces [20, 29, 30, 34], primary care practices [2528], occupational health services [21, 22, 24], and specialty medical clinics [23, 3133].

In some studies, all participants were working at baseline [28, 29, 34], while in others, all participants were on work disability leave [30] or sick leave [2022, 24]. Four studies included a mix of participants who were working, on sick leave, or unemployed [23, 25, 3133]. One study did not report working status at baseline [27].


Table 3 summarises the interventions. The 12 studies identified cover a diverse range of interventions that include psychological interventions [20, 31, 32], enhanced primary care [2528], enhanced psychiatric care [23], enhanced occupational physician roles [21, 22, 24], integrated care management [29, 30], exercise [33], and a worksite intervention [34].

Table 3 Intervention characteristics

The psychological interventions involved psychological treatments, such as cognitive behavioural therapy (CBT) and psychotherapy, which are normally delivered by psychologists or psychotherapists. However, in one trial [20], one of the interventions (brief CBT-based stress management with a focus on improving workplace processes) was delivered by “labour experts”. Enhanced primary care involved physicians and nurses working in the primary care centres or managed care organizations. The predominant components of this approach were education for physicians and nurses on guideline-concordant care and reinforcement to adhere to these guidelines. Enhanced psychiatric care involved out-patient psychiatric treatment enhanced by occupational therapy. Enhanced occupational physician role consisted of an intervention approach that was aimed at establishing a more active role for the occupational physician in the management of work disability and in the prevention of work disability recurrences. Systems integration and care management interventions refer to interventions conducted at the organizational or health-care system level. In this systematic review, the interventions were aimed at appropriate diagnosis, adherence to treatment, adequate follow-up, and ensuring collaboration among all individuals involved in the care management of workers with depression. The exercise intervention consisted of three different types of exercises (strength, aerobic and relaxation training) without an “inactive” control group. People with depression were referred from general practitioners, private practicing psychiatrists, psychologists or psychiatric wards to participate in exercise training twice a week for 32 weeks in a hospital setting. The worksite intervention consisted of a stress reduction program in which supervisors were asked to list possible work stressors in their worksites and to make plans to reduce these stressors while a working committee made the plans feasible. The supervisors started stress reduction activities and the committee monitored their activity periodically.

Risk of Bias in Included Studies

Overall, each study demonstrated a high risk of at least one type of bias (Table 4). All 12 studies were judged to be at an overall high risk of bias, which reduces the certainty of the findings.

Table 4 Overall risk of bias across studies

A high risk of selection bias was most common and was due to inadequate allocation methods [29, 30, 34], lack of information on allocation methods [20, 2528], differences between participants and non-participants [25, 26, 28] and baseline differences [23, 33, 34].

Four studies demonstrated a high risk of attrition bias [27, 29, 31, 32, 34] due to important differences between those who remained in the study and those who were lost to follow-up.

Risk of performance bias was high in a number of studies due to failure to report on participants’ compliance with their assigned intervention [21, 22, 24, 29, 31, 32, 34], as well as issues of contamination [2124, 33] and co-intervention [33].

Only two studies [3133] demonstrated a high risk of measurement bias owing to the lack of blinded outcome assessment.

Reporting bias was high in three studies [2527, 29] due to the use of multiple imputations for large quantities of missing data.

Evidence Synthesis

As all of the studies were judged to have high risk of bias and many outcomes—based on evidence from only one study—lacked precision and consistency, the grade of evidence in all cases was considered to be “very low”.

Half of the studies assessed the impact of an enhanced physician role. However, the type of enhancements and quality improvements were very different and varied according to the distinct disability insurance and health care system in place. Primary care enhancements were conducted in the USA [2528] and included education on guideline-concordant interventions, screening for depression, and more frequent contacts with patients especially regarding adherence to treatments (pharmacological or psychotherapy). The results from these studies were mixed (positive and neutral). In another study [23], psychiatric care was enhanced by the addition of an occupational therapist that focused on contacting the worker and the employer to discuss a program for work reintegration. This study was conducted in The Netherlands and the results were mixed (positive and neutral). An enhanced occupational physician role was examined in two studies from The Netherlands [21, 22, 24] where they evaluated a more active role for the physician by guideline-based education and facilitation of RTW. The results were mixed (positive and neutral).

The studies examining integrated care management showed mixed findings (positive and neutral) [29, 30] and one study of a psychological intervention that used an inactive control [20] showed mixed findings (positive and neutral, and negative and neutral). One study of a worksite stress reduction program was conducted in Japan and showed positive findings [34]. One trial of exercise did not have an inactive control group [33].

Because the evidence was graded as “very low” for all outcomes identified, the key message from this review is that some intervention approaches are feasible and could therefore be further evaluated in future studies:

  • Enhanced Primary Care

  • Enhanced Psychiatric Care

  • Enhanced Role for the Occupational Physician

  • Psychological Interventions

  • Worksite Stress Reduction

  • Integrated Care Management


Our systematic review was designed to answer the question: “Which intervention approaches to manage depression in the workplace have been successful and yielded value for employers in developed economies?” We included ten randomised trials and two non-randomised studies from various countries and jurisdictions that evaluated a wide range of intervention practices to manage the impact of mild to moderate depression in the workplace. The evidence derived from all studies and intervention approaches for the primary outcomes of interest was graded as “very low” in all cases. A combination of factors contributed to this grade of evidence: the high risk of bias in all included studies, the paucity of studies for each outcome, which affected the consistency and precision of the evidence, and populations and outcomes that do not directly generalise to the population of interest. In addition, it was challenging to integrate data across diverse disability insurance and health care systems.

Consequently, there is no one intervention that we have found that can be recommended as effective for the four main outcomes suggested by the stakeholders (prevention and management of work disability/sickness absence, work functioning and recurrences of work disability/sickness absence).

The results from our review are consistent with those of one recently published Cochrane review that evaluated the effects of interventions aimed at reducing sickness absence/work disability in depressed workers [35]. They concluded that there was no evidence of an effect of medication alone, enhanced primary care, psychological interventions or combinations on sickness absence of depressed workers. Other recently published systematic reviews were not focused on depression [36, 37], or did not focus on working populations [38, 39]. Others focused on clinical (e.g., improvement in depression) or process of care outcomes (e.g., medication adherence), rather than work-related outcomes of more direct relevance to workplaces [40, 41]. Examples of such outcomes have been previously described using a classification framework informed by stakeholders of Ontario’s health and safety system (Table 1) and may be informative for future research in this area. There are narrative reviews [42, 43] concluding that cognitive-behavioural therapy and interpersonal therapy reduce work disability and are cost-effective.

It is interesting to note that the majority of the included studies were not “workplace-based” or “work-directed” in terms of the setting or approach. Most studies concerned clinical interventions focused on the individual worker, often within the (collaborative or enhanced) health care setting. These clinical interventions might be implemented or facilitated by the employer to manage depression in the workplace—depending on the health care and jurisdictional context. However, along with the worker-focused intervention approaches which might be feasible and need further evaluation, particular challenges and barriers in the implementation of interventions to manage depression in the workplace have to be addressed. For example, in their recent report on best practices for return-to-work/stay-at-work interventions for workers with mental health conditions, Pomaki et al. [36] conclude among others that more research is needed to better understand stigma and discrimination, to increase supervisor and co-worker awareness and support, and to focus on work and the workplace. Future studies might consider to combine organizational-level interventions with work(er-)-focused interventions.

It is not yet known the optimal timing of the intervention in the course of a depressive episode, and the duration of the intervention’s effect. It is unknown whether the positive results reported in some studies generalise to different compensation and health care systems. The review clearly showed the challenges in the definition and interpretation of work-related outcomes (such as sickness absence or work disability) across studies from different jurisdictions. Interventions and programs aiming at these work-related outcomes are shaped by the health care and jurisdictional context, and may not be directly relevant to other jurisdictions.

Strengths and Limitations of the Review

Our review was conducted by an international and multidisciplinary team, who received input and feedback from a Canadian stakeholder group. Stakeholder involvement was essential in shaping the research question, suggesting terms for the literature search, prioritising outcome measures, and interpreting the key findings.

Even though we used a comprehensive search with broad inclusion criteria, it is possible some relevant studies were still missed. We used a validated method to judge the risk of bias of the included studies, but the judgments are in most cases subjective. Our choice to do a qualitative synthesis instead of a meta-analysis pooling was directed by the type of data, but it could have been argued that our choice was not the most appropriate.

Given the prevalence of depression in the workplace and the costs associated with work disability and productivity loss at work, even a small effect size with economic benefits may be regarded as relevant to employers and employees. Although ten of the 12 included studies used a randomised controlled design, there were many features of study design, study performance or analyses that jeopardised validity. For instance, due to the inherent nature of these interventions, all included studies lacked the ability to appropriately blind intervention providers and participants to the intervention, introducing the risk of performance and measurement biases. Several studies featured inadequate descriptions of participation and adherence to the proposed interventions, potential differences between participants and non-participants, potential differences between remaining participants and those lost to follow-up, or the methods used to randomly allocate individuals. Contamination was also a problem in several studies, while some studies did not account for baseline differences between groups in the analysis.


Future studies should reduce the risk of bias by focusing on randomised trials, blinding, and to adhere to the CONSORT standards for description and reporting [44]. Blinding participants to the intervention received is challenging, but cluster randomisation may facilitate this. Future studies should also describe the baseline working status (working or on disability/sick leave) and attempt to report the result for each distinct baseline working status in order to more specifically address whether an intervention is effective to prevent work disability/sickness absence or to manage work disability/sickness absence. There is also a need for valid and reliable outcome measures, and a consensus on what should be measured when approaching productivity or loss of productivity at work.

The problem of depression in the workplace is complex, with consequences to the worker and their families, co-workers, supervisors and employers, disability insurers, and government. No single intervention approach was shown to be effective to manage workers with depression, but the current review provides some direction for future research in terms of types of feasible interventions, study design, and framework for outcome measures.


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Nancy Carnide is supported by a Canadian Institutes of Health Research Vanier Canada Graduate Scholarship. Kimberley Cullen is supported by a National Sciences and Engineering Research Council of Canada Graduate Scholarship. The team is grateful to Quenby Mahood and Joanna Liu for their assistance with literature searches and article retrieval. We would also like to thank all of the stakeholders who participated in our two meetings.

Conflict of interests

All authors have completed the Unified Competing Interest form at (available on request from the corresponding author) and declare: no financial relationships with any organisations that might have an interest in the submitted work in the previous 3 years; no other relationships or activities that could appear to have influenced the submitted work.


This review was funded by the Canadian Institutes of Health Research, Evidence on Tap—Expedited Knowledge Synthesis—Competition 200911ETP.

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Furlan, A.D., Gnam, W.H., Carnide, N. et al. Systematic Review of Intervention Practices for Depression in the Workplace. J Occup Rehabil 22, 312–321 (2012).

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  • DOI:


  • Depression
  • Workplace
  • Systematic review