title: Numerator analysis of fertility change in Costa Rica: a methodological examination.
mesh_terms: D000293:Adolescent; D000328:Adult; D001723:Birth Rate; D003364:Costa Rica; D003710:Demography; D005260:Female; D005298:Fertility; D006801:Humans; D008423:Maternal Age; D008433:Mathematics; D008875:Middle Aged; D010298:Parity; D011247:Pregnancy