ContextMore than half of the bipolar disorder (BD) cases have an additional diagnosis; one of
the most difficult to manage is obsessive-compulsive disorder (OCD). Although some
authors recently investigated the co-occurrence of anxiety and BD, the topic remains
insufficiently studied. The current study aimed to investigate differences in comorbid
OCD between BD-I and BD-II.Evidence AcquisitionA systematic review and meta-analysis was conducted on the prevalence and predictors of
comorbid BD-I/BD-II and OCD. Relevant papers published until June 30, 2015 were
identified searching the electronic databases MEDLINE, Embase, PsycINFO and the Cochrane
Library.ResultsFourteen articles met the inclusion criteria. The pooled prevalence of BD-I in OCD was
3.9% (95% confidence interval (CI), 2.4 to 6.4, I2 = 83%, Q = 56) while that of BD-II in
OCD was 13.5% (95% CI, 9.3 to 19.3, I2 = 89%, Q = 91). The pooled prevalence of OCD in
BD-I was 21.7 (95% CI, 4.8 to 60.3, I2 = 84%, Q = 95). With regard to OCD-BD predictors,
mean age and rate of males did not predict the prevalence of BD-I (β = 0.0731, 95% CI,
-0.1097 to 0.256, z = 0.78; β = 0.035, 95% CI, -0.2356 to 0.1656, z = 0.34) and BD-II (β
= 0.0577, 95% CI, -0.1942 to 0.0788, z = 0.83; β = -0.0317, 95% CI, -0.1483 to 0.085, z
= 0.53) in OCD. The mean age explained some of the observed heterogeneity (R2 = 0.13; R2
= 0.08).ConclusionsThis first systematic review and meta-analysis of the prevalence and predictors of
comorbid BD-I/BD-II and OCD suggests that BD-OCD comorbidity is a common condition in
psychiatry. However, the available evidence does not allow to assess whether BD-I or
BD-II are more common in patients with OCD.