Figure 4

Sex and gender biases in risk factors and co-morbidities for severe 2009 H1N1 disease. Several risk factors predispose patients to increased morbidity and mortality from 2009 H1N1. The likelihood of engaging in behaviors associated with increased exposure as well as the severity and prevalence of co-morbidities associated with severe 2009 H1N1 disease differ between males and females.