A new method for estimating the level of natural fertility in populations practicing birth control.
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D002648:Child; D002675:Child, Preschool; D005006:Ethnicity; D005191:Family Characteristics; D005193:Family Planning Services; D005260:Female; D005298:Fertility; D006801:Humans; D007223:Infant; D008393:Marriage; D008722:Methods; D008962:Models, Theoretical; D009026:Mortality; D010298:Parity; D010414:Pennsylvania; D012067:Religion; D013223:Statistics as Topic; D014481:United States