Matched and unmatched: a comparison of two designs, with epidermiologic data.
D000704:Analysis of Variance; D001943:Breast Neoplasms / Q000453:epidemiology; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007231:Infant, Newborn; D008722:Methods; D011247:Pregnancy; D012042:Registries; D012494:Sampling Studies; D013223:Statistics as Topic; D014427:Twins