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Table 1 A 2 × 2 table of chromosome counts: counts of chromosomes for cases and controls according to allele of a diallelic marker locus where N is the total sample size and A and a the two alleles at the locus

From: Sex chromosomes and genetic association studies

Allele Cases Controls Total
A X N A - X N A
a N1 - X N - N1 - N A + X N a = N - N A
Total N 1 N0 = N - N1 N