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Crude prevalence (weighted percentages are presented) of depression (defined as a PHQ-9 score of ≥10) from the National Health and Nutrition Examination Survey 2005–2008. *P < .01 for comparison with mean PHQ-9 score by number of visual function problems (reference: mean PHQ-9 score for those reporting no visual function problems). PHQ-9 indicates 9-item Patient Health Questionnaire.
