title: A matching procedure for epidemiological studies.
mesh_terms: D000293:Adolescent; D000328:Adult; D000704:Analysis of Variance; D004522:Educational Status; D004812:Epidemiologic Methods; D005163:Factor Analysis, Statistical; D005191:Family Characteristics; D005260:Female; D006801:Humans; D008297:Male; D008423:Maternal Age; D008875:Middle Aged; D009790:Occupations; D010298:Parity; D011247:Pregnancy; D044469:Racial Groups; D012067:Religion; D014427:Twins