Birth order and family size: bias caused by changes in birth rate.
D000293:Adolescent; D000328:Adult; D000368:Aged; D001722:Birth Order; D001723:Birth Rate; D004739:England; D005191:Family Characteristics; D005260:Female; D006801:Humans; D008131:London; D008297:Male; D001523:Mental Disorders; D008875:Middle Aged; D011159:Population Surveillance; D012494:Sampling Studies; D012801:Sibling Relations; D013223:Statistics as Topic; D014852:Wales