Data from the National Comorbidity Survey reveals significant gender differences in the lifetime prevalence of certain psychological disorders. For instance, females have higher rates of major depressive disorder (20% vs. 13% for males) and post-traumatic stress disorder (10% vs. 3%). In contrast, males show markedly higher rates of substance abuse disorders, such as alcohol abuse (20% vs. 7% for females) and drug abuse (12% vs. 5%).