Among individuals with schizotypal personality disorder, what percentage have comorbid major depressive disorder?

• A. 10-20%
• B. 60-70%
• C. 30-50%
• D. 80-90%

Answer: (C)

Understanding how often major depressive disorder occurs alongside schizotypal personality disorder helps you gauge how mood symptoms intersect with the broader schizophrenia spectrum. People with schizotypal personality disorder often experience social isolation, peculiar beliefs, and work or school difficulties that can heighten distress and make them more susceptible to depressive episodes. However, not everyone with schizotypal personality disorder develops major depressive disorder, so the comorbidity isn’t universal.

The commonly cited range for this comorbidity is about 30-50%. That reflects a substantial minority to roughly half of individuals with schizotypal personality disorder meeting criteria for major depressive disorder at some point in their lives. This makes the 30-50% range the best fit.

Why the other ranges don’t fit as well: 10-20% would underestimate how frequently mood disturbances co-occur in this group, while 60-70% or 80-90% would imply that nearly all individuals with schizotypal personality disorder have a major depressive disorder, which isn’t supported by evidence. Keep in mind estimates can vary by study sample and whether you’re looking at lifetime or current comorbidity.