Table 2. Risk of pterygium in relation to polymorphisms in genes involved in BaP metabolites in a population-based sample.

Gene	OR	95% CI	p-value
CYP1A1
m1/m1	1	-	-
m1/m2	1.327	0.906–2.079	0.135
m2/m2	1.647	1.154–2.350	0.006
GSTM1
Present	1	-	-
Null	1.012	0.683–1.500	0.952