Gender ratios among reading-disabled children and their siblings as a function of parental impairment.
Gender ratios are reported for 374 reading-disabled probands and their 530 siblings included in five independent studies of reading disability. Ratios were tabulated for each study as a function of parental impairment (neither parent affected, mother only affected, father only affected, and both parents affected). Results reveal a small excess of male probands in referred and clinic samples of reading-disabled children, but not in research-identified samples. Gender ratios among siblings of reading-disabled probands are approximately 1:1. In addition, combined results indicate that gender ratios of neither probands nor their siblings vary substantially as a function of parental impairment.
Wadsworth
S J
SJ
Institute for Behavioral Genetics, University of Colorado, Boulder 80309.
DeFries
J C
JC
Stevenson
J
J
Gilger
J W
JW
Pennington
B F
BF
D000328:Adult; D001077:Aptitude Tests; D002648:Child; D016241:Child of Impaired Parents / Q000523:psychology; D004200:Diseases in Twins / Q000235:genetics; D004410:Dyslexia / Q000175:diagnosis / Q000235:genetics* / Q000523:psychology; D005260:Female; D008040:Genetic Linkage / Q000235:genetics; D006801:Humans; D007360:Intelligence / Q000235:genetics; D008297:Male; D008957:Models, Genetic; D012744:Sex Ratio