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. Author manuscript; available in PMC: 2009 Dec 5.
Published in final edited form as: Am J Med Genet B Neuropsychiatr Genet. 2008 Dec 5;147B(8):1511–1518. doi: 10.1002/ajmg.b.30874

Table 3.

Pooled analysis of Met allele of Val158Met (COMT) from two independent studies

TDT (our data)† Case-control (Qian et al 2003) Combined result
Male ADHD T/NT = 162/114 Met/Val = 170/376 --
Female ADHD T/NT =77/78 Met/Val = 18/70 --
Males vs. Females χ2=3.27, P=0.071 X2=4.145, P=0.042 Z= 2.69, P=0.007
†

T/NT = transmission/nontransmission of Met allele

*

Both studies report significant association of Met allele with male ADHD.