Table 1.

Physical, social, and demographic characteristics of cases with skin lesions and matched controls in Pabna, Bangladesh

Cases (n)Controls (n)P
Physical
    % Male61.7 (555)61.8 (556)0.96*
    Mean BMI20.0 (900)20.2 (900)0.05
Social
    Education<0.0001*
        % no school (illiterate)20.5 (184)15.0 (135)
        % no school (able to write)30.4 (273)24.7 (222)
        % primary12.2 (110)13.0 (117)
        % secondary32.6 (293)41.4 (372)
        % college +4.3 (39)5.9 (53)
    % Chew tobacco14.8 (133)14.8 (131)0.96*
    % Chew betel nuts28.6 (256)23.9 (215)0.03*
    % Ever smoked28.9 (254)31.6 (281)0.17*
Demographic
    Hb categories0.0175*
        % Hb <12 g/dL (anemic)13.7 (123)10.5 (94)
        % Hb 12.1-14.0 g/dL71.0 (638)70.1 (629)
        % Hb 14.1-18.0 g/dL15.4 (138)19.4 (174)
    Median water arsenic (μg/L)39.0 (868)11.4 (872)<0.0001
    Median toenail arsenic (μg/g)3.70 (899)1.6 (896)<0.0001
  • * The null hypothesis that the variable did not vary by case-control status was tested using the χ2 test.

  • The null hypothesis that the mean value did not differ by case-control status was tested using the t test.

  • The null hypothesis that the median value did not differ by case-control status was tested using the Wilcoxon rank sum test.