Table 2.

The comparisons between the observed percentage with the expected percentage of control subjects carrying UGT1A7*1/*2, UGT1A7*1/*3, and UGT1A7*2/*3 genotypes.

	Control subjects (n = 441)		χ2	P
	Observed percentage (%)	Expected percentage (%)1
UGT1A7*1/*2	26.5	28.9	0.081	0.960
UGT1A7*1/*3	17.0	20.4
UGT1A7*2/*3	7.3	7.1

¹The expected percentage was calculated by the Hardy-Weinberg equilibrium. For example, expected percentage of UGT1A7*1/*2 = 2×(frequency of UGT1A7*1/*1)^1/2×(frequency of UGT1A7*2/*2)^1/2 = 2×41.7^1/2×5.0^1/2 = 28.9%.