Association of Environmental Arsenic Exposure, Genetic Polymorphisms of Susceptible Genes, and Skin Cancers in Taiwan

Table 2

Distribution of demographic variables, arsenic exposure level, and percentage of monomethylarsonic acid (MMA) between skin cancer cases and age and sex matched controls.

Variable	Group	Case		Control		OR (95% CI)
		Number	(%)	Number	(%)
Age	(Mean ± Std deviation)	56.13 ± 6.87		54.38 ± 6.26
Gender	Male	46	(65.71)	138	(65.71)
	Female	24	(34.29)	72	(34.29)
Cumulative; as exposure; (ppm-year)	<10.0	4	(5.71)	40	(19.05)	1.00	(Referent)
	10.0–19.9	22	(31.43)	62	(29.52)	3.55	(1.14–11.06)
	20.0+	31	(44.29)	59	(28.10)	5.25	(1.72–16.05)
	Unknown	13	(18.57)	49	(23.33)	2.65	(0.80–8.77)
MMA percentage (%)	0–13.81	21	(30.00)	94	(44.76)	1.00	(Referent)
	13.81+	36	(51.43)	80	(38.10)	2.01	(1.09–3.73)
	Unknown	13	(18.57)	36	(17.14)	1.61	(0.73–3.57)