Table 2. CYP1A genotype^a distribution among pterygium (n=150) and control^b (n=50) subjects, p=0.035.

Genotype	Pterygium, n (%)	Control, n (%)
m1/m1	50 (33.3)	26 (52.0)
m1/m2	78 (52.0)	16 (32.0)
m2/m2	22 (14.7)	8 (16.0)

^aCYP1A1 allelic variants analyzed in this study are based on prior pterygium samples [14,15]. ^bFrom superior conjunctiva of 20 patients and medial conjunctiva of 30 patients without pterygium or pinguecula.