Table 3.

Association of passive smoking with dysmenorrhea stratified by genotypes of CYP1A1MspI^a

CYP1A1MspI	Passive Smoking	Dysmenorrhea
		N(%)	OR*	95%CI	p
Model 1
T/T6235†	No	22(24.7)	1.0	---	---
	Yes	19(25.7)	1.1	0.5~2.1	0.913
T/C6235†	No	120(27.8)	1.0	---	---
	Yes	137(33.7)	1.3	1.0~1.8	0.056
C/C6235†	No	99(29.8)	1	---	---
	Yes	124(39.6)	1.5	1.1~2.1	0.011
Model 2
T/T6235†	0	22(24.4)	1.0	---	---
	1~20	18(26.9)	1.1	0.5~2.3	0.739
	>20	1(16.7)	0.5	0.1~5.0	0.585
T/C6235†	0	123(27.6)	1.0	---	---
	1~20	116(33.9)	1.4	1.0~1.9	0.047
	>20	18(36.0)	1.5	0.8~2.7	0.210
C/C6235†	0	100(29.8)	1.0	---	---
	1~20	102(38.6)	1.5	1.0~2.1	0.027
	>20	21(46.7)	2.1	1.1~3.9	0.024

^*Estimates were derived from logistic regression models with adjustment for perceived stress.

^†Reference category.

^aT/T6235 indicates homozygous wild type; T/C6235 indicates heterozygous variant type; C/C6235 indicates homozygous variant type.