Errors of Weinberg's difference method.
D000293:Adolescent; D000328:Adult; D005260:Female; D005821:Genetic Techniques; D006801:Humans; D008297:Male; D008423:Maternal Age; D008433:Mathematics; D011247:Pregnancy; D011272:Pregnancy, Multiple; D012744:Sex Ratio; D014427:Twins; D014429:Twins, Dizygotic; D014430:Twins, Monozygotic