Table 2.

Associations between demographic characteristics and skin lesions (N=11,416)^a.

	Skin lesions present		Odds Ratio 95 % CI p-value
	No.	%
Sex
male	293	5.10%	Ref
female	329	5.80%	1.86 1.45, 2.37 <0.01
Age category
0–10	0	0.00%
11–15	7	0.60%
16–20	10	0.90%
21–30	37	2.00%
31–40	124	5.70%
41–50	181	10.60%
51–60	139	11.10%
61–70	90	11.40%
71–80	31	9.80%
>80	3	5.40%	1.04b 1.03,1.04 <0.01
Education
college	5	1.70%
high school	41	3.60%
middle school	224	4.80%
primary school	157	5.40%
some primary or none	195	8.10%	0.87c 0.78,0.97 0.02
Drinking
never drinker	411	4.70%	Ref
ever drinker	211	8.10%	1.59 1.24,2.04 <0.01
Farm worker
No	51	1.10%	Ref
Yes	571	8.20%	3.93 2.86,5.41 <0.01
Smoking
never smoker	341	4.30%	Ref
smoked 1 year or less	2	3.00%	0.95 0.25,3.69 0.95
smoked 1–10 years	42	4.00%	0.92 0.63,1.33 0.66
smoked 10–20 years	83	7.60%	1.11 0.80,1.52 0.54
smoked over 20 years	154	11.30%	1.33 0.98,1.81 0.07
Arsenic categories
0–5 μg/L	58	1.80%
5.1–10 μg/L	32	3.80%	2.52 1.47,4.30 <0.01
10.1–20 μg/L	53	4.20%	2.83 1.77,4.53 <0.01
20.1–50 μg/L	235	6.90%	3.94 2.78,5.59 <0.01
			6.03 4.05,8.97 <0.01
50.1–100 μg/L	128	8.30%
100.1–300 μg/L	107	10.50%	8.83 5.77,13.51 <0.01
>300 μg/L	9	9.80%	7.94 2.73,23.12 <0.01
Yearly HH Income(Yuan, imputed)
0–999	15	6.50%
1000–9999	437	5.60%
>=10000	170	5.00%	1.13c 0.93,1.37 0.22
Water source
Otherd	213	6.60%
Hand pump well	409	5.00%	0.52 0.41,0.65 <0.01

a) Table only considers 11,416 respondents with complete data.

b) Odds ratio per year increase in age.

c) Odds ratio for trend in increasing education and increasing income category.

d) Consists of residents with a community well (99%) and unknown water source (1%).