NRS: numerical rating scale. β : partial regression coefficient of hair arsenic (μg/g). OR: odds ratio. CI: confidence interval.

^a Adjusted for age and education.

^b Adjusted for age, village, occupational exposure history, and arsenic-related skin lesions.

^c Adjusted for age, frequency of bath, temperature of bath water, and use of cleansing product.

^d Adjusted for age, allergy to certain substances and cough.

^e Adjusted for significant covariates including age, village, occupational exposure history, arsenic-related skin lesions, frequency of bath, temperature of bath water, use of cleansing product, allergy to certain substances, cough.