Abstract
Hazardous alcohol use is increasing amongst some groups of women, yet little is known about the underlying reasons or gender-specific influences. The purpose of this study was to explore the association between psychological childbirth trauma and women’s hazardous alcohol use. We aimed to identify predictors of hazardous alcohol use given childbirth-related trauma, other life trauma (combat, natural disasters, physical or sexual assault, experiences threatening loss of life or loss of loved ones) and coping motives for drinking, whilst controlling for age, socio-economic status, negative affect and other drinking motives (enhancement and social motives). Australian data from the Why Women Drink survey (N = 301) was analysed. Women who experienced childbirth as traumatic scored higher overall for hazardous drinking and endorsed coping reasons more strongly than those who did not. Analyses of individual differences affecting hazardous drinking revealed coping reasons, rather than trauma itself, as the strongest predictor in a regression model. Other significant predictors included socio-economic status, enhancement of positive emotions and, marginally, negative affect. Findings identified a link between traumatic childbirth and hazardous drinking as a coping strategy. Prospective research is required to characterise predisposing and perpetuating vulnerabilities determining maladaptive coping after traumatic childbirth, and to inform effective interventions.
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The hazardous use of alcohol has devastating social and economic consequences for both the individual and society (GBD, 2016 Alcohol Collaborators, 2018; Rehm, 2011). Alcohol is responsible for three million deaths, or 5.3% of total deaths, worldwide every year and contributes 5.1% to the global burden of disease and injury (World Health Organization, 2018).
In Australia, 25.7% of adult males and 9.9% of adult females drink at hazardous levels, as defined by the National Health and Medical Research Council (NHMRC) lifetime risk guidelines, with one in four people ‘binge’ drinking at least once per month, that is, exceeding the NHMRC risk guidelines of not more than four standard drinks on any one occasion, and one in seven doing so weekly (Australian Institute of Health and Welfare, 2020; National Health and Medical Research Council, 2020).
Australian NHMRC guidelines conceptualise hazardous use according to the harm that could arise from alcohol consumption at various quantities and frequencies. These guidelines state that, for healthy adults, drinking no more than ten standard drinks per week reduces the lifetime risk of alcohol-related harm and drinking no more than four standard drinks per occasion reduces the risk of alcohol-related injury on that occasion, where a standard drink contains 10 g of pure alcohol (Australian Institute of Health and Welfare, 2020; NHMRC, 2020). These guidelines are in line with the World Health Organization’s recommended low-risk drinking level of not more than 20 g of alcohol per day, 5 days per week (Higgins-Biddle and Babor, 2018). In the current study, the term hazardous use is used to refer to levels of drinking exceeding that limit, as distinct from the severe mental health disorders of addiction or alcohol use disorder (AUD). AUD is defined as a problematic pattern of alcohol use, which leads to clinically significant levels of impairment or distress, and which is characterised by a cluster of symptoms that may include craving, tolerance, withdrawal, an inability to control alcohol use, and the continued use of alcohol despite it causing recurrent social, interpersonal, occupational, physical or psychological problems (American Psychiatric Association, 2013).
Historically, men have consumed significantly more alcohol than women and until recently, most interventions or treatments for AUD were developed and tested in a predominantly male population (Agabio et al. 2016; McCrady et al. 2020). However, examination of drinking trends over recent decades suggests that the gender gap in alcohol consumption is closing, in part due to increasing alcohol use by women in younger birth cohorts (Slade et al. 2016). This is concerning particularly as women are more vulnerable than men to the effects of alcohol, due to higher blood alcohol concentrations after equivalent doses of alcohol (Nolen-Hoeksema and Hilt, 2006), and are also at higher risk for alcohol-related diseases such as liver disease, heart disease and breast cancer (Erol and Karpyak, 2015; Freudenheim, 2019; Maddur and Shah, 2019). There is a pressing need to understand the factors underlying problem drinking in certain groups of women, to inform the best possible interventions and most appropriate public health messaging to counter the trend.
Motivational models of alcohol use generally distinguish between social reasons for use, and the phenomenologically distinct behaviour of drinking to regulate emotions (Cooper, 1994; Cooper et al. 1995). The latter comprises both enhancement motives, using alcohol to increase positive mood states or enhance positive emotional experience, and coping motives, whereby alcohol is used primarily as an escape or avoidance mechanism, or to manage stress and other negative emotions. Drinking to cope is the motive most strongly associated with hazardous drinking (Cooper et al. 1992; Grant et al. 2007; Mohr et al. 2018).
Hazardous use of alcohol can be a maladaptive coping response to trauma. There is an accumulated body of evidence demonstrating that exposure to traumatic events, such as natural disasters, physical or sexual assault or combat, is related to the hazardous use of alcohol and that the severity of the trauma may be positively associated with the quantity of alcohol consumed (Cerda et al. 2011; Kachadourian et al. 2014; Ullman et al. 2013). At clinical extremes, there is a strong association between post-traumatic stress disorder (PTSD) and AUD (Blanco et al. 2013; Debell et al. 2014; Gilpin and Weiner, 2017). Furthermore, women are more vulnerable than men to developing post-trauma symptoms, are more likely to use emotion and avoidance focused coping strategies and are more likely to start drinking excessively after experiencing trauma (Kachadourian et al. 2014; Olff et al. 2007).
One potentially traumatic event that women are commonly exposed to is childbirth. Yet this event is not explicitly included in any of the standard trauma exposure measures, despite up to half of women reporting a psychologically traumatic birthing experience (Alcorn et al. 2010; O’Donovan et al. 2014), and evidence that a traumatic birthing experience can result in the same PTSD symptoms as those from other traumatic events (James, 2015). Although only around 3% of women who experienced a traumatic childbirth go on to develop clinical levels of postnatal PTSD (Grekin and O'Hara, 2014), many women experience some post-trauma symptoms after giving birth. More than a quarter of women whose childbirths were deemed medically uneventful report clinically significant levels on at least one PTSD subscale (Ayers et al. 2016).
Given the evidence linking trauma exposure and PTSD symptoms with alcohol misuse, particularly amongst women (Debell et al. 2014; Kachadourian et al. 2014), and that postnatal PTSD is associated with poor coping (Ayers et al. 2016; van Heumen et al. 2018), it is possible that women who experienced psychological trauma during childbirth may subsequently drink alcohol for coping reasons and may therefore be drinking at more hazardous levels than women who did not experience such trauma. If childbirth-related psychological trauma is identified as a driver of hazardous alcohol use, it would indicate an important target for intervention to prevent or treat subsequent alcohol misuse for women who experienced traumatic childbirth.
The aim of this study was therefore to explore the potential association between psychological childbirth trauma and women’s hazardous alcohol use. The role of coping motives for drinking and the possible potentiating effect of additional traumatic life experiences were also explored. In considering individual differences, the aim was also to identify the predictors of hazardous alcohol use, given childbirth-related trauma, other life trauma (such as combat, natural disasters, physical or sexual assault or other experiences threatening loss of life or loss of loved ones) and coping motives for drinking, whilst controlling for age, socio-economic status, negative affect and other drinking motives (enhancement and social motives).
Methods
Procedure and Participants
This study uses cross-sectional data collected for the ‘Why Women Drink’ survey, detailed elsewhere (Hunt et al., in preparation), and received ethical approval. Participants were recruited through free and paid advertising on social media platforms (Facebook, Instagram and Twitter) and after providing informed consent, completed an online survey hosted by Survey Monkey (www.SurveyMonkey.com). Survey respondents were female, aged 18 years or over and resident in Australia. As childbirth trauma and alcohol consumption were key variables of interest here, the sub-sample selected for analysis in this study was restricted to women who have ever given birth, who answered questions on the survey relevant to perinatal PTSD and who had consumed alcohol within the 6 months preceding the survey (N = 301).
Measures
Demographics
The following demographic information was collected: age range, country of birth, cultural group or heritage, education level, occupation, employment status, income, marital status, number of children and each child’s age. Age, income and education were collected in the survey as categorical variables, following Australian Bureau of Statistics (ABS) categories. They were converted to pseudo-continuous variables for inclusion in the regression analysis. Age and income were determined using the median value of the range corresponding to their categorical values. Level of education was captured in the survey by asking year of high school completed and highest qualification obtained. Approximate number of years of education was calculated using the number of years of school completed and a best estimate in years of any further qualifications obtained. As education and income were moderately correlated (rs = 0.42, p < 0.001), a composite socio-economic status (SES) variable was further created, using the mean of the z-score standardised education and income variables.
Alcohol Use
The Alcohol Use Disorders Identification Test (AUDIT; Saunders et al. 1993) was used to assess hazardous drinking levels. Scores of 8 or above on the AUDIT indicate hazardous use of alcohol and possible dependence (Babor et al. 2001). It should be noted that some researchers have recommended lower thresholds of 5 (Neumann et al. 2004) or 6 (Foxcroft et al. 2014) on the total AUDIT score to indicate hazardous drinking amongst women; however, widespread agreement about the optimal value has not been reached.
Motivations for alcohol use were assessed using the 15-item Drinking Motives Questionnaire (DMQ; Cooper et al. 1992). This questionnaire captures different reasons for use related to coping with negative emotions (e.g. ‘to forget your worries’), enhancing positive emotions (e.g. ‘because it’s exciting’) and social reasons (e.g. ‘it makes a social gathering more enjoyable’). Relative frequency for each of the reasons for use was scored on a scale from 1 to 4 where 1 is almost never/never; 2 is sometimes; 3 is often; and 4 is almost always, following Stewart, Zeitlin and Samoluk (1996).
Trauma
The Modified Perinatal Post-Traumatic Stress Disorder Questionnaire (PPQ; Callahan et al. 2006) was used to measure post-traumatic symptoms after childbirth, including symptoms of intrusion, avoidance and hyperarousal. The clinical threshold for high risk of postnatal PTSD is a score of 19 or above (Callahan et al. 2006).
Ten other questions on the survey asked about other types of traumatic events an individual may have experienced, such as combat, natural disasters, physical or sexual assault and other experiences which threaten loss of life or loss of a loved one. The Impact of Event Scale–Revised (IES-R; Weiss, 2007) was utilised to assess the effect of those traumas. Scores of 24 or higher on the IES-R indicate partial PTSD and scores of 33 or more indicate probable PTSD.
Negative Affect
The short-form version of the Depression Anxiety and Stress Scales (DASS-21; Lovibond and Lovibond, 1995) was used to measure the degree of depression, anxiety and stress, on separate subscales. As the depression, anxiety and stress subscales of the DASS-21 were all highly inter-correlated (pairwise correlation coefficients 0.55–0.63, see Table 1), the DASS-21 total score was used as a single indicator of negative affect (Henry and Crawford, 2005).
Statistical Analysis
Data analysis was performed using IBM SPSS Statistics version 25 and all tests were two-tailed. Spearman’s correlations (rs) were used to explore bivariate associations, as much of the data did not meet tests of normality.
Independent samples t tests were conducted to compare women who did or did not experience their birth(s) as traumatic on hazardous drinking, as measured by total AUDIT scores; coping motives for alcohol use; and other life trauma. Where Levene’s test for equality of variances was significant, equal variances were not assumed and the adjusted p value was used.
A standard multiple regression analysis was conducted to determine whether trauma in general, childbirth-related trauma specifically, and/or coping motives for drinking, predicted hazardous drinking (total AUDIT scores), whilst accounting for covariates of age, socio-economic status, negative affect and enhancement and social drinking motives, which have all previously been associated with drinking habits (Bloomfield et al. 2006; Cooper et al. 1995; Hobden et al. 2017; Kushner et al. 1990; Wilsnack, 2012; Wilsnack et al. 2009).
Most assumptions for a regression analysis were met, with the exception that the residuals deviated moderately from normal and showed some heteroscedasticity. This does not affect the accuracy of the beta weights in the model but may mean that the values are underestimated. To account for that possibility, significance values were calculated using bootstrapped standard errors with 1000 iterations (Erceg-Hurn and Mirosevich, 2008).
Results
Sample Characteristics
The sample comprised women who had ever given birth and who had consumed alcohol in the 6 months preceding the survey (N = 301). Participants were aged 18–74 years, 84% (n = 254) were born in Australia and 4% (n = 12) in New Zealand. Most of the respondents were aged over 35 years, with just over half (51%, n = 154) in the 35–44 age group and the mean time since childbirth was 8.6 years (SD = 4.2). More than half of the sample had a tertiary education, with a bachelor, master or doctorate degree (56%, n = 168) and 82% (n = 248) were in full- or part-time work. The majority of participants were living with a partner, either married or de facto (79%, n = 239), 12% (n = 35) were previously partnered (separated, divorced or widowed) and 6% (n = 19) were single.
Preliminary Analyses
A quarter (25%; n = 75) of the sample scored in the clinical range for mothers at high risk of perinatal PTSD (19 or higher on the PPQ). Spearman’s bivariate correlations, means and standard deviations for study variables are shown in Table 1.
Childbirth Trauma, Alcohol Use and Coping Motives
Women who had experienced psychological birth trauma had significantly higher total AUDIT scores, t (98.17) = − 2.57, p = .012, and more strongly endorsed coping motives for alcohol use, t (107.08) = − 3.86, p < .001, compared to women without such trauma (Table 2). Additionally, they had significantly higher scores for psychological trauma from non-childbirth-related sources, t (97.64) = − 3.89, p < .001), although the group mean was still below the clinical threshold indicative of partial PTSD (IES-R < 24).
Multiple Regression
Overall, the model was significant and accounted for 48% of the variance in AUDIT scores (R2 = .481, adjusted R2 = .465, F (8, 269) = 31.11, p < .001). Regression coefficients, both unstandardised (B) and standardised (β), significance values and squared semi-partial correlations for each predictor are shown in Table 3.
The strongest predictor of AUDIT score was coping motives, which accounted uniquely for 7% of the variance (squared semi-partial correlations; sr2). Other significant unique predictors were SES (2%), enhancement motives (2%) and DASS-21 total score (1%).
Neither trauma related to childbirth nor trauma related to other events was a significant unique predictor of alcohol use.
Discussion and Conclusion
Although the link between the experience of trauma and alcohol use is well-established (Blanco et al. 2013; Debell et al. 2014; Gilpin and Weiner, 2017; Kachadourian et al. 2014; Olff et al., 2007), this is the first study, to the authors’ knowledge, that specifically examined this link in the context of childbirth. Results from comparison of group means showed that women with psychological childbirth trauma reported drinking at more hazardous levels and more strongly endorsed coping motives for drinking than women without childbirth trauma. When individual differences were analysed as predictors of the variance in hazardous drinking, neither childbirth trauma nor trauma from other sources were significant independent contributors. Rather, coping motives not only independently contributed but was the strongest unique predictor of drinking levels amongst the factors tested. This is consistent with the well-established link between coping motives and problem drinking found in the literature (Cooper et al. 1995; Grant et al. 2007; Hasking et al. 2011; Mohr et al. 2018). Other risk factors previously linked to hazardous drinking were also identified. Socio-economic status, indexed by education and income, was a significant negative predictor of hazardous alcohol use, in concordance with previous studies showing that lower SES related to higher daily alcohol consumption (Yusuf and Leeder, 2015) or to binge drinking (Giskes et al. 2011). Negative affect was strongly associated with the experience of trauma from any source and approached significance as a predictor of hazardous alcohol use, consistent with the high comorbidity between depression/anxiety and alcohol misuse that is already well-documented (Baker et al. 2012; Hobden et al. 2018; Kushner et al. 1990).
The findings presented here indicate that women with childbirth trauma represent a vulnerable group at high risk of misusing alcohol. However, it is not the post-traumatic symptoms per se that are indicative of hazardous alcohol use; more relevant is how an individual copes with the effects of the trauma and/or subsequent life stressors. When identifying and working with groups of women likely to be engaging in hazardous drinking patterns, attention must therefore be paid to their available repertoire of coping skills, which may function as a mediator of the effects of trauma and stress on drinking to cope (Merrill and Thomas, 2013; Roos and Witkiewitz, 2016).
Using alcohol to enhance or induce positive emotions (enhancement motives) was strongly linked to coping motives for drinking and also predicted hazardous levels of alcohol use, albeit to a lesser degree. This suggests that another important factor to consider in regards to problem drinking is the capacity to adaptively regulate one’s emotions (Simons et al. 2017). Indeed, a critical role for emotional dysregulation has been identified in drinking to cope, at least in samples of young adults (Aurora and Klanecky, 2016; Chandley et al. 2014; Messman-Moore and Ward, 2014). Amongst students exposed to trauma, difficulty with emotion regulation mediated the association between PTSD symptoms and quantity of alcohol consumed (Radomski and Read, 2016). Conversely, teaching coping skills targeted towards distress tolerance and emotion regulation was shown to reduce alcohol consumption in individuals with comorbid AUD and PTSD (Stappenbeck et al. 2015) and a broader repertoire of coping skills may facilitate better alcohol treatment outcomes (Roos and Witkiewitz, 2016). Interventions for alcohol use where coping drinking motives are involved could therefore focus on developing both emotion regulation skills and more adaptive coping strategies.
Limitations
There are various potential biases within the data. Results from this study may not be generalisable to the broader Australian population, as over half of the sample was tertiary educated, inconsistent with population norms. However, this group is certainly worthy of study, given previous research showing that more highly educated women are more likely to be drinking at problematic levels (Huerta and Borgonovi, 2010; OECD, 2015). As there were no exclusion criteria, it is possible that women who were drinking at hazardous levels and/or met criteria for AUD prior to giving birth may have been included in the study, which may have biased the results. The data used here comprise self-report measures which may suffer from such limitations as recall bias and social desirability. In particular, an unavoidable limitation is that most existing behavioural health scales, including measures of alcohol use, have not been validated for post-partum women and it is possible that social desirability concerns may lead to underreporting of hazardous use (Walker et al. 2015). The current findings should therefore be interpreted in consideration of the lack of validation of alcohol use scales for the post-partum population, albeit this is somewhat mitigated in this study, as the average time since childbirth is more than 8 years—we have not predominantly sampled a post-partum population. Notwithstanding, this is an important consideration for future studies and, as Walker et al. 2015) suggested, research could explore alternate phrasing of items on such scales, with the aim of eliciting more truthful responses.
The present study utilised existing data with a cross-sectional design to explore a previously untouched topic, with results confirming the link between traumatic experiences and drinking to cope. To allow for greater understanding of the contingencies leading to drinking as a maladaptive coping strategy and how this might unfold over time, and/or throughout multiple childbirth experiences, longitudinal research is warranted, following women pre- and post-natally. A better appreciation of the importance of individual differences in coping with adversity is much needed in this area of research, to better understand the link between traumatic childbirth experience and the hazardous use of alcohol by some women. In future studies of this area, examination of adaptive coping skills, emotion regulation skills and other factors such as aspects of personality may be considered to provide important contextual information surrounding how and why women might be using alcohol to cope and provide detailed information about reasons for coping, available coping repertoire and the capacity to regulate emotions. It is recommended that future studies include pathway analysis of childbirth trauma and hazardous alcohol use, guided by an appropriate conceptual model.
Conclusion
Given as many as one in four women in the sample experienced a psychologically traumatic childbirth, and that on average these women reported drinking at more hazardous levels, it is important that treatments focus on how women cope, with the aim of developing a repertoire of healthy coping strategies, so that alcohol consumption is not needed as a coping mechanism.
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MD thanks Ute Vollmer-Conna, Rochelle Einboden and Jess Beilharz for many inspiring and helpful discussions centred on the themes relevant to this work.
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Both authors made substantive contributions to this study. SH designed the original study and collected the data. MD conducted literature searches and provided summaries of previous research, conducted the statistical analysis and wrote the first draft of the manuscript. Both authors contributed to and approved the final manuscript.
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Doherty, M., Hunt, S.A. An Association Between Psychological Childbirth Trauma and Hazardous Alcohol Use. Int J Ment Health Addiction 21, 3185–3198 (2023). https://doi.org/10.1007/s11469-022-00784-3
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DOI: https://doi.org/10.1007/s11469-022-00784-3