The ratio of 2nd and 4th digit length in autistic children
Noipayak, P.
Journal of the Medical Association of Thailand 92(8): 1040-1045
2009
ISSN/ISBN: 0125-2208 PMID: 19694328 Document Number: 15544
To compare 2D:4D ratios of autistic to non-autistic children as a risk factor of autism. A hospital based case-control study was conducted from March 2007 to July 2008. Demographic data and general risk factors of autism had been collected using questionnaires from case and age matched control subjects aged 18 months to 15 years. Length of 2nd and 4th digits was measured by an electronic digital caliper. The ratio of right hand 2D:4D of autistic children was 0.99 +/- 0.06 compared with 1.02 +/- 0.04 of non-autistic children (p = 0.01). On the other hand, 2D:4D ratio of left hand of autistic children was 0.99 +/- 0.07 while the ratio of non-autistic children was 1.01 +/- 0.03 (p = 0.04). The 2D:4D ratio of both hands between 0.96 and 1.01 were risk factors of autism with odds ratio between 3.22 and 5.35 (p < 0.05). The ratios of 2D:4D of both hands of autistic children were lower than non-autistic children. The ratios of 2D:4D between 0.96 and 1.01 of both hands associated with an increased risk of autism in children aged 18 months to 15 years.
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