516681
research-article2013
ANP0010.1177/0004867413516681ANZJP ArticlesWatson et al.
Research
Australian & New Zealand Journal of Psychiatry
2014, Vol. 48(6) 564–570
DOI: 10.1177/0004867413516681
Childhood trauma in
bipolar disorder
© The Royal Australian and
New Zealand College of Psychiatrists 2013
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Stuart Watson1, Peter Gallagher1, Dominic Dougall2,
Richard Porter3, Joanna Moncrieff2, I Nicol Ferrier1
and Allan H Young4
Editor’s Choice
Abstract
Objective: There has been little investigation of early trauma in bipolar disorder despite evidence that stress impacts
on the course of this illness. We aimed to compare the rates of childhood trauma in adults with bipolar disorder to a
healthy control group, and to investigate the impact of childhood trauma on the clinical course of bipolar disorder.
Methods: Retrospective assessment of childhood trauma was conducted using the Childhood Trauma Questionnaire
(CTQ) in 60 outpatients with bipolar disorder being treated for a depressive episode and 55 control participants across
two centres in north-east England and New Zealand.
Results: Significantly higher rates of childhood trauma were observed in patients with bipolar I and bipolar II disorder compared to controls. Logistic regression, controlling for age and sex, identified emotional neglect to be the only
significant CTQ subscale associated with a diagnosis of bipolar disorder. Childhood history of sexual abuse was not a
significant predictor. Associations with clinical severity or course were less clear.
Conclusions: Childhood emotional neglect appears to be significantly associated with bipolar disorder. Limitations include
the relatively small sample size, which potentially increases the risk of type II errors. Replication of this study is required,
with further investigation into the neurobiological consequences of childhood trauma, particularly emotional neglect.
Keywords
Bipolar disorder, childhood trauma, depression, emotional neglect
Introduction
The high prevalence and incidence (Merikangas et al.,
2011), chronicity of symptoms (Judd et al., 2002, 2003),
and psychosocial impairment (Judd et al., 2005) of bipolar
disorder underlines the need to establish its aetiological and
risk factors. Bipolar disorder is highly heritable (McGuffin
et al., 2003); psychosocial stress also appears to increase
the likelihood of first and possibly subsequent episodes
(Etain et al., 2008; Post, 1992). Childhood trauma is a recognised indicator of poor prognosis in major depressive
disorder (Douglas and Porter, 2012; Nanni et al., 2012) but,
in bipolar disorder, whilst the impact of stressors in adulthood on the course of illness has been investigated (Cohen
et al., 2004; Paykel, 2003), the impact of early trauma has
been relatively neglected. One study has shown that early
parental loss is more common (Agid et al., 1999), whilst
others have shown that childhood stressful life events are
less common (Horesh et al., 2011) or as common (Horesh
Australian & New Zealand Journal of Psychiatry, 48(6)
and Iancu, 2010) in bipolar disorder compared with healthy
controls. Children and adolescents with bipolar disorder
have been shown to be exposed to more negative life events
and less positive events compared to controls (Romero
et al., 2009), although interestingly, a recent paper suggested that the link between stressful events and bipolar
disorder may be a consequence of the illness (Hosang et al.,
1The
Institute for Neuroscience, Newcastle University, Newcastle, UK
of Brain Sciences, University College London, London, UK
3Department of Psychological Medicine, University of Otago,
Christchurch, New Zealand
4Centre for Affective Disorders, Institute of Psychiatry, Kings College
London, London, UK
2Faculty
Corresponding author:
Stuart Watson, The Wolfson Unit, Campus for Aging and Vitality, The
Institute for Neuroscience, Newcastle University, Newcastle NE4 6BE,
UK.
Email: stuart.watson@newcastle.ac.uk
565
Watson et al.
2012). Studies using the Childhood Trauma Questionnaire
(CTQ) (Bernstein et al., 2003) have reported a higher rate
of childhood trauma (Fowke et al., 2012), particularly emotional abuse (Etain et al., 2010), in bipolar disorder.
Retrospectively reported childhood abuse has been associated with an adverse illness course (Garno et al., 2005;
Leverich et al., 2002), more depressive episodes (Garno
et al., 2005), greater severity of mania (Garno et al., 2005;
Leverich et al., 2002), with earlier onset (Carballo et al.,
2008; Garno et al., 2005; Leverich et al., 2002), suicidal
ideation (Carballo et al., 2008; Leverich et al., 2002), substance abuse (Brown et al., 2005; Carballo et al., 2008), and
with impaired performance on tests of neuropsychological
function (Savitz et al., 2008). However, interpretation of
these findings is limited by the clinical and methodological
heterogeneity of these studies (Daruy-Filho et al., 2011).
In this study, childhood trauma, as measured by the
CTQ, was compared in a sample of people with bipolar disorder recruited for a randomised trial (Watson et al., 2012)
and in a healthy control group. It was predicted that higher
CTQ scores would be associated with a diagnosis of bipolar
disorder and secondly, that childhood trauma would be
associated with measures of clinical severity.
Methods
Sample
This analysis uses baseline assessment data from a randomised placebo-controlled trial of mifepristone treatment
in bipolar depression (Watson et al., 2012). The study was
carried out in two centres, Newcastle University in the
north-east of England and Otago University in Christchurch,
New Zealand.
The main inclusion criterion was a diagnosis of bipolar
disorder current episode depressed, confirmed with the
Structured Clinical Interview for DSM-IV (SCID) (First
et al., 1997). Additional inclusion criteria were: age between
18 and 65 years, stable medication for a minimum of 4
weeks, the ability to provide informed consent and the ability to adequately understand both written and verbal
English. Both men and women were eligible.
Potential participants were excluded if they fulfilled criteria for substance abuse or dependence (First et al., 1997),
were pregnant, suffered significant medical illness which
would render recruitment into the clinical trial unsafe (such
as: suffered head trauma with persistent loss of consciousness, a neurological disorder or uncompensated endocrine
disorder). A co-morbid axis II diagnosis was not an exclusion
criterion. After a complete description of the study, written
informed consent was obtained from all participants. The
study received full approval from the local ethics committee.
Participants were recruited from outpatient clinics allied
to the respective centres. Sixty patients were randomized
over a 5-year period from October 2004, of which 31
patients met SCID criteria for bipolar I and 25 the criteria
for bipolar II. A cohort of 55 age- and sex-matched comparators, who were SCID confirmed as having no current or
past history of an axis I disorder, was concurrently locally
recruited.
Assessment
After an initial screening visit, baseline data was collected
by trained psychiatrists with full history, case note and
medication review. The data included demographic and
clinical characteristics of sex, age, body mass index (BMI),
pre-morbid IQ measured by the National Adult Reading
Test (NART) (Nelson and Willison, 1991) and number of
years of education. Measures which may indicate clinical
severity included: the 17-item version of the Hamilton
Depression Rating Scale (HDRS-17) (Hamilton, 1960);
diagnosis of DSM-IV melancholia; length of the current
depressive episode (weeks); number of previous hospitalisations; current alcohol intake (standard UK alcohol units
per week); diagnosis of rapid cycling bipolar disorder; history of attempted suicide; any form of current suicidal ideation reported to the assessor.
The childhood trauma questionnaire (CTQ) was also
completed. The CTQ is a validated 28-item self-report
questionnaire used to provide a retrospective measure of
childhood trauma (Bernstein et al., 2003). It uses a fivepoint Likert-type scale. Twenty-five of the CTQ questions
are split into five subscales of maltreatment: emotional
abuse, physical abuse, sexual abuse, emotional neglect and
physical neglect. The other three questions are used for
detecting ‘false-negative’ answers involving a minimisation/denial scale.
Statistical analyses
Distributions of CTQ scores did not meet the assumption
required for parametric analysis. Where appropriate, the
bipolar group was divided into SCID (First et al., 1997)
determined bipolar I and bipolar II subgroups. Chi-squared
(χ2) test was used to compare sex distribution across bipolar
and control groups. Age and BMI were normally distributed and were compared across bipolar and control groups
using the independent samples t-test. The Mann–Whitney
U-test and Spearman’s rank order correlations were used
for all other comparisons of continuous variables.
CTQ subscales for pooled bipolar and control data were
examined using Spearman’s rho to identify significant correlations between subscales to determine suitability for
inclusion in a regression analysis. Spearman’s rho was also
used to examine relationships between CTQ subscale scores
and the demographic variables, age, pre-morbid IQ (NART
score) and years of education. CTQ subscale scores were
compared between males and females. Step forward logistic
regression of CTQ total scores and relevant demographic
Australian & New Zealand Journal of Psychiatry, 48(6)
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ANZJP Articles
variables was performed to examine the overall relationship
between trauma and bipolar disorder, with the binary outcome variable of bipolar or control group. A separate step
forward logistic regression of the relevant CTQ subscales
and demographic variables was performed to explore for
relationships according to types of trauma.
Results
Patients and controls were matched for age, sex, pre-morbid IQ (NART score) and years of education, as reported in
Table 1.
A diagnosis of bipolar disorder was found to be significantly associated with a greater total CTQ score (Table 2).
All subscale scores were significantly higher in the bipolar
group, apart from sexual abuse. Similar results were found
when the analysis was restricted to those with a diagnosis
of bipolar I. In participants diagnosed with bipolar II, CTQ
total, emotional abuse, emotional neglect and physical
neglect scores were significantly greater than controls.
Table 3 shows that in bipolar patients, CTQ scores did
not differ between those with and those without suicidal
ideation, although scores for the emotional neglect subscale
showed a trend towards significance. Participants with a
diagnosis of DSM-IV melancholia had significantly higher
CTQ total scores, and significantly higher emotional
neglect and emotional abuse scores than those without.
Participants with a diagnosis of rapid cycling bipolar disorder had higher sexual abuse subscale scores than those who
were not rapid cycling. In bipolar patients who reported one
Table 1. Demographic and clinical characteristics of the bipolar group and control group.
Bipolar patients
% or mean (SD)
Controls
% or mean (SD)
Comparison (p)
Male (%)
53.3
54.5
χ2 = 0.02 (0.896)
Age (mean years)
47.9 (9.4)
45.1 (13.1)
t = 1.3 (0.193)
BMI
29.8 (6.2)
26.0 (3.7)
t = 3.0 (0.004)
110.6 (10.5)
113.3 (11.3)
U = 1152.5 (0.089)
14.7 (3.3)
14.8 (4.3)
U = 917.0 (0.554)
NART IQ
Years of education
BMI: body mass index; NART IQ: National Adult Reading Test IQ.
Table 2. CTQ scores in bipolar groups compared to controls.a
All bipolar
N = 60b
Bipolar I
N = 31b,c
Comparison
CTQ (SD)
U
p
Bipolar II
N = 25b,c
Control
N = 55%
Comparison
Comparison
CTQ (SD)
U
p
CTQ
(SD)
U
p
CTQ (SD)
CTQ total
44.4
(19.1)
490.0 < 0.001
43.6
(20.6)
280.5
0.004
41.1
(13.1)
203.0
0.003
31.2
(8.0)
Emotional
abuse
10.4
(5.4)
780.0 < 0.001
10.2
(5.8)
470.0
0.012
9.7
(4.3)
294.0
0.005
6.8
(2.8)
Physical
abuse
7.5
(4.4)
903.0
0.005
7.9
(4.9)
461.0
0.005
6.0
(2.1)
439.5
0.387
5.4
(1.3)
Sexual
abuse
7.7
(5.4)
1092.5
0.131
7.9
(4.9)
584.5
0.182
7.1
(4.1)
428.5
0.224
6.2
(3.1)
12.4
(6.0)
767.0 < 0.001
12.7
(7.0)
459.5
0.011
11.1
(4.2)
299.0
0.008
8.2
(3.5)
7.9
(3.8)
787.5 < 0.001
8.1
(4.2)
446.0
0.002
7.2
(3.0)
306.5
0.003
5.7
(1.7)
Emotional
neglect
Physical
neglect
aTable showing mean and SD of CTQ scores in different subject groups with a comparison using Mann–Whitney U-test of CTQ scores between the
bipolar groups (all bipolar patients and those with a diagnosis of bipolar I or bipolar II) with controls.
bNumbers vary due to the incomplete return of CTQs: all bipolar, N = 49–57; bipolar I, N = 25–31; bipolar II, N = 20–22; control, N = 39–45.
cFour participants with bipolar disorder were not sub-classified as either bipolar I or II.
CTQ: Childhood Trauma Questionnaire.
Australian & New Zealand Journal of Psychiatry, 48(6)
567
vary due to the incomplete return of CTQs: history of attempted suicide, yes N = 23–29, no N = 21–23; current suicidal ideation, yes N = 11–13, no N = 34–40; rapid cycling, yes N = 6, no N = 38–46; DSM-IV melancholia,
yes N = 21–24, no N = 23–27.
CTQ: Childhood Trauma Questionnaire.
aNumbers
0.046
222.0
(3.8)
6.9
(3.7)
8.9
137.0 0.976
(3.5)
7.8
9.3
9.2
Physical
neglect
(4.3)
6.6
(2.7)
218.5
0.029
6.8
(2.2)
8.2
(4.3) 235.0 0.597
(6.5)
0.031
210.0
(5.2)
10.9
(6.0)
129.5 0.807 14.3
(5.9)
12.6
12.5
13.7
Emotional
neglect
(6.4)
11.4
(5.4)
255.0
0.146
9.7
(5.9)
13.1
(6.0) 169.0 0.058
(6.7)
0.907
319.0
(5.3)
7.6
(6.0)
8.2
75.5 0.038
(5.0)
7.4
12.7
9.0
Sexual
abuse
(6.2)
6.7
(4.6)
265.0
0.198
8.4
(4.9)
7.7
(5.8) 190.0 0.184
(7.9)
0.227
264.5
(3.5)
7.0
(4.3)
7.8
116.0 0.503
(3.9)
7.2
10.2
8.3
Physical
abuse
(5.6)
6.9
(2.8)
322.5
0.831
6.8
(3.2)
7.9
(4.9) 234.0 0.569
(7.7)
0.216
259.0
(4.2)
8.9
(6.2)
113.5 0.479 11.6
(5.3)
10.1
12.3
11.5
Emotional
abuse
(5.9)
9.2
(5.0)
260.5
0.174
10.1
(5.6)
10.4
(5.6) 256.0 0.933
(6.4)
0.023
p
U
(14.9) 145.0
CTQ (SD)
(20.8) 37.7
CTQ (SD)
p
U
92.0 0.451 49.8
(16.3)
(SD)
CTQ
(32.6) 42.9
56.8
CTQ (SD)
p
U
(20.3) 176.5 0.781
(SD)
CTQ
(19.4) 44.7
(SD)
CTQ
42.8
0.051
p
U
Comparison
(12.8) 158.5
CTQ (SD)
(23.1) 38.3
CTQ (SD)
No
N = 42a
Yes
N = 14a
No
N = 24a
Yes
N = 31a
51.6
No
N = 48a
Yes
N = 7a
Comparison
Rapid cycling
Current suicidal ideation
History of attempted suicide
Table 3. Analyses of bipolar group clinical severity and clinical characteristics.
CTQ total
No
N = 29a
Yes
N = 25a
Comparison
DSM-IV melancholia
Comparison
Watson et al.
or more previous suicide attempts, CTQ total score was
higher (p = 0.051), and scores significantly higher in the
emotional abuse subscale.
No significant correlations between CTQ total or CTQ subscale scores and length of current episode, number of previous
hospitalizations, current severity of depression (HDRS-17
score), current alcohol intake were found (rs < 0.3, p > 0.1).
Bivariate correlations between pooled bipolar and control scores of the five trauma subscales found significant
correlations between all subscales (0.33 < rs < 0.64, p <
0.002), apart from between physical and sexual abuse (rs =
0.12, p = 0.17). All correlations were below 0.8 and therefore could be entered into a regression model without risk
of multi-colinearity. Differences or associations with CTQ
subscale scores and demographic characteristics were limited to age, which was significantly, but weakly, correlated
with emotional neglect (rs = 0.14, p = 0.046) and sexual
abuse scores which were significantly higher in females (U
= 873.0, p < 0.001). NART scores or years of education
were not significantly correlated with the CTQ subscales
(rs < 0.2, p > 0.1). The factors considered to be plausible
independent causal risk factors, i.e. CTQ total score, age
and sex, were entered into step forward logistic regression,
with the dependent variable of group (bipolar or control).
This confirmed CTQ total score was the only significant
predictor (β = 0.08, p = 0.001). The five subscale scores,
age and sex, were then entered into a second step forward
logistic regression, also with the dependent variable of
group. Emotional neglect (β = 0.185, p < 0.001) remained
the only significant predictor in the model (Table 4).
Emotional abuse approached significance (p = 0.082).
Discussion
This paper demonstrates significant associations between
childhood trauma and bipolar disorder. Higher CTQ scores
were found in patients diagnosed with both bipolar I and
bipolar II disorder compared to controls. Sexual abuse was
the only subscale measure that was not higher in bipolar
patients compared with controls. In bipolar patients with a
diagnosis of DSM-IV melancholia, emotional neglect and
physical neglect scores were higher. CTQ subscale scores
were higher in those with a past history of attempted suicide or a diagnosis of rapid cycling bipolar disorder.
Logistic regression showed CTQ total scores to differentiate bipolar patients from controls, and separately identified
emotional neglect to be the only significant subscale of the
CTQ to differentiate bipolar patients from controls.
Emotional abuse approached significance and may therefore be considered as a potential contributor to the model.
Our study is in line with the findings of two previous
studies which also found that patients with a diagnosis of
bipolar disorder reported higher rates of childhood trauma
compared to healthy controls (Etain et al., 2010; Fowke
et al., 2012). Exploring the subscales, we did not find
Australian & New Zealand Journal of Psychiatry, 48(6)
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ANZJP Articles
Table 4. Logistic regression of CTQ subtypes predicting a
diagnosis of bipolar disorder (I and II).
Step 1
Age
Gender
Emotional abuse
Physical abuse
Sexual abuse
Physical neglect
Step 1a
Emotional neglect
Constant
Score
df
0.324
0.119
3.030
1.790
0.017
1.865
1
1
1
1
1
1
p
0.569
0.730
0.082
0.181
0.896
0.172
β
Wald
p
0.185
1.651
14.393
10.246
< 0.001
0.001
CTQ: Childhood Trauma Questionnaire.
significant differences in the sexual abuse scale, which is
in accord with one previous report (Etain et al., 2010) and
is supported by a recent paper that found sexual abuse to
be the least reported form of abuse by bipolar patients
(Larsson et al., 2013), although other studies did find this
association (Fowke et al., 2012; Hyun et al., 2000). Our
findings differed in identifying emotional neglect, as
opposed to an earlier finding of emotional abuse, to be the
single significant subscale associated with bipolar disorder
(Etain et al., 2010; Fowke et al., 2012). Methodological
differences with the previous studies utilising the CTQ
(Etain et al., 2010; Fowke et al., 2012) relate to the presence or absence of current episode and to the sample size.
Our finding that a history of childhood trauma is related to
a history of suicide attempts in bipolar patients is also in
line with other studies (Alvarez et al., 2011; Carballo et al.,
2008; Garno et al., 2005; Leverich et al., 2002), although
two of these studies did not use a validated measure to
retrospectively assess for childhood trauma (Carballo
et al., 2008; Leverich et al., 2002).
The allostatic impact of childhood trauma may be mediated through a range of biological systems with the hypothalamic–pituitary–adrenal (HPA) axis appearing to have a
central role (Grande et al., 2012). It can also be argued that
childhood trauma, at sensitive periods, may trigger an
altered developmental pathway (Bateson et al., 2004),
mediated in part by epigenetic processes (McGowan et al.,
2009). For example, the regulation of hippocampal GR
expression (McGowan et al., 2009) may induce ‘evolutionary appropriate’ responses such as increased vigilance,
alertness to danger, responsivity to novel stressors and a
willingness to explore new environments (Glover, 2011).
The trade-off for such responses may be an increased risk
of behavioural problems in childhood (Ramchandani et al.,
2012) and of adult psychopathology including bipolar disorder (Watson et al., 2007) and suicidality (McGowan
Australian & New Zealand Journal of Psychiatry, 48(6)
et al., 2009). It is of interest that emotional neglect was the
only subscale which significantly differentiated patients
from controls. Emotional neglect suggests a pervasive deficiency in the parent–child relationship (Glaser, 2002), has
been repeatedly linked with HPA axis dysregulation in
adults (Gerra et al., 2008, 2010; Watson et al., 2007) and
has been previously shown to be differentially related to
depression (Spinhoven et al., 2010).
It has been suggested that retrospective assessment of
childhood trauma may be liable to recall bias in depressed
patients (Lewinsohn and Rosenbaum, 1987). However, it
should be noted that autobiographical recall of events (as
measured using CTQ scores) in our study did not significantly correlate with severity of depression. CTQ scores
have also been demonstrated to remain stable over time and
to be independent of the current degree of abuse-related psychopathology (Paivio, 2001). Although there have been
concerns that retrospective reporting overestimates associations between abuse and adult psychopathology compared
to prospective assessment (Gilbert et al., 2009), a recent
study found retrospective, compared to prospective, assessment of maltreatment predicted similar rates of mental disorder (Scott et al., 2012). A previous study has shown that
recall bias accounted for less than 1% of reporting variance
for measures of childhood abuse (Fergusson et al., 2011).
However, emotional neglect is arguably the most subjective
and difficult to define among forms of abuse, and hence further examination of the relationship between abuse and
neglect and bipolar disorder in prospective studies which
exclude recall bias would be useful. Investigations with
euthymic bipolar patients would help to clarify the potential
impact of current mood state. A weakness of this study is the
relatively small sample size, which engenders the risk of
type II errors. Further, the use of baseline data from a randomized controlled trial may have resulted in an under-sampling of more severe bipolar patients or those with
comorbidities, which in turn may have resulted in an underestimation of the rates of childhood trauma in the bipolar
group given the association between childhood trauma and
poorer clinical outcomes (Garno et al., 2005; Leverich et al.,
2002).
Conclusions
The association of perceived childhood trauma and depression is established (Nanni et al., 2012). This study adds to
the literature suggesting a similar relationship in bipolar
disorder, although confirmation in prospective studies is
desirable. Emotional neglect may be particularly pernicious. Further consideration of its psychological and neurobiological mediation is warranted.
Acknowledgements
We are grateful to the participants who contributed to the research
and to all those who helped in participant recruitment.
Watson et al.
Funding
The study was funded by the Stanley Medical Research Institute
(REF.: 03T-429) and the Medical Research Council (REF.: G0401207).
Declaration of interest
The authors declare that there is no conflict of interest. The
funders did not influence the design or dissemination of the study.
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