Relative and standardized prevalence of major depression by gender and four demographic characteristics — Medical Monitoring Project (MMP), 2009 and Behavioral Risk Factor Surveillance System (BRFSS), 2006 and 2008.

wgt. %  =  weighted %; SE  =  standard error; PR  =  prevalence ratio (unadjusted); SPR  =  standardized prevalence ratio; 95% CI = 95% confidence intervals.
Responses to the Eight-item Patient Health Questionnaire were used to define “major depression” according to criteria from the Diagnostic and Statistical Manual of Mental Disorders, 4th Edition.