title: Physical Activity, Gender Difference, and Depressive Symptoms.
abstract: OBJECTIVE
  To investigate the roles of physical activity (exercise) and sociodemographic factors in depressive symptoms among men and women in the United States.
  
  
  METHODS
  2011 U.S. Behavioral Risk Factor Surveillance System (BRFSS).
  
  
  METHODS
  Patient Health Questionnaire Depression Scale (PHQ-8) scores are aggregated and divided into five categories. An ordered switching probability model with binary endogenous physical activity is developed to accommodate ordinality of depression categories and ameliorate statistical biases due to endogeneity of physical activity.
  
  
  RESULTS
  Average treatment effects suggest physical activity ameliorates depressive symptoms among mildly and moderately depressed individuals, most notably among mildly depressed women. Gender differences exist in the roles of sociodemographic factors, with age, income, race, education, employment status, and recent mental health condition playing differentiated roles in affecting depressive symptoms.
  
  
  CONCLUSIONS
  Regular physical activity reduces depressive symptoms among both men and women with mild to moderate depression, notably among women.
authors: Department of Agricultural and Resource Economics, University of Maryland, College Park, MD.
authors: Jun
authors: J
authors: Zhang
authors: STY Health Econometrics, Knoxville, TN.
authors: Steven T
authors: ST
authors: Yen
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D040343:Behavioral Risk Factor Surveillance System; D003863:Depression / Q000453:epidemiology*; D015444:Exercise; D005260:Female; D006304:Health Status; D006801:Humans; D008297:Male; D008875:Middle Aged; D015233:Models, Statistical; D012307:Risk Factors; D012621:Seasons; D012737:Sex Factors; D012959:Socioeconomic Factors; D014481:United States
keywords: Depressive symptoms; gender difference; ordered probability model; physical activity
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