Zero Population Growth, Inc.: a second study.
D000022:Abortion, Spontaneous; D000328:Adult; D000367:Age Factors; D001290:Attitude; D004522:Educational Status; D005191:Family Characteristics; D005260:Female; D006801:Humans; D007182:Income; D008297:Male; D008875:Middle Aged; D009935:Organizational Affiliation; D011155:Population Control; D011247:Pregnancy; D012067:Religion; D012737:Sex Factors; D011795:Surveys and Questionnaires; D014481:United States; D014659:Vasectomy; D014837:Voluntary Health Agencies