Table 2– Logistic regression model in male and female nonsmokers combined, comparing quintiles of well water arsenic concentration with the presence or absence of arsenic skin lesions
Independent variablesAdjusted OR (95% CI)p-value
Well arsenic quintile#
 1: reference1.00
 21.80 (1.02–3.16)0.043
 32.79 (1.62–4.78)<0.001
 43.09 (1.82–5.23)<0.001
 53.94 (2.36–6.58)<0.001**
Age1.05 (1.03–1.06)<0.001
Education0.95 (0.92–0.99)0.007
Sex0.27 (0.20–0.35)<0.001
Systolic BP1.01 (0.99–1.01)0.167
BMI group+
 11.41 (1.07–1.87)0.016
 20.66 (0.37–1.19)0.170
  • BP: blood pressure; BMI: body mass index. #: the reference well water arsenic concentration was <7 μg·L−1, with quintiles as described in table 1; : the reference for sex was male; +: BMI categorised as low (<18.5 kg·m−2; group 1) and high (≥25 kg·m−2; group 2). **: p<0.01 by Chi-squared test for trend.