Is everybody happy?
D000367:Age Factors; D003710:Demography; D003863:Depression; D004522:Educational Status; D004644:Emotions; D006262:Health; D006306:Health Surveys; D006801:Humans; D011647:Puerto Rico; D012737:Sex Factors; D012959:Socioeconomic Factors; D013223:Statistics as Topic; D014481:United States; D014492:United States Public Health Service