Above, how Democrats, Republicans, and people who identified as neither responded to questions about all 12 conditions. Respondents were people who had completed other SurveyMonkey surveys; SurveyMonkey gave them the choice to complete our survey afterward, and donated 50 cents to the charity of their choice if they did so. The margin of error for the survey was 3%, meaning it's hard to draw conclusions about some of the rarer conditions. But in our survey, Republicans were less likely than Democrats to have PTSD, ADD, anxiety, or depression — or at least less likely to admit it.