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Table 1 Characteristics of Skin-Lesion Cases and Population-Based Controls in Pabna, Bangladesh

From: A case-control study of GST polymorphisms and arsenic related skin lesions

   Controls Cases
Diffuse Melanosis    n = 377
Leukomelanosis    n = 342
Spotted Melanosis    n = 145
Diffuse Keratosis    n = 117
Spotted Keratosis    n = 73
Hyperkeratosis    n = 40
Mean Age in yrs (SD) 33.7 (12.6) n = 597 33.9 (12.7) n = 592 P = 0.58
Mean Body Mass Index (kg/m2) (SD) 20.4 (3.1) n = 597 20.1 (3.1) n- = 592 P = 0.70
% Male 60.3% n = 360 60.3% n = 357 P = 0.91
Mean Duration of Present well use(yrs) (SD) 10.1 (9.0) n = 592 8.0 (7.2) n = 592 P = 0.02
% Reported a Previous Well 2.84% n = 17 7.77% n = 45 P < 0.0001
Mean As concentration of current well (μg/l) (SD) 66.2 (149.6) n = 595 232.8 (315.7) n = 592 P < 0.0001
Mean Daily Total Water/Liquid consumption (L) (SD) 3.8 (1.2) n = 595 3.7 (1.1) n = 592 P = 0.84
% Ever used Betel nuts 24.3% n = 145 27.7% n = 164 P = 0.007
Mean Years of Betel nut Use (SD) 10.8 (8.9) n = 143 11.0 (9.5) n = 160 P = 0.78
Mean Number of Betel nuts chewed per day (SD) 5.6 (3.6) n = 158 5.7 (3.8) n = 149 P = 0.53
% Chew tobacco leaves 16.4% n = 587 17.1% n = 590 P < 0.0001
Mean Years of Tobacco leaves chewed (SD) 9.9 (9.1) n = 95 10.9 (9.4) n = 95 P = 1.0
% Smokes Cigarettes Currently 30.5% n = 597 26.7% n = 592 P = 0.03
% Ever Smoked 31.0% n = 597 28.7% n = 592 P = 0.0007
Education Level n = 597 N = 592 P = 0.80
% Illiterate 17.4% n = 104 22.9% n = 136  
% Literate (incomplete Primary Education) 23.8% n = 142 29.4% n = 174  
%Completed Primary Education 11.7% n = 79 11.8% n = 70  
% Completed Middle School Education 31.9% n = 191 23.5% n = 139  
%Completed Secondary Education or More 13.6% n = 81 26.0% n = 154  
Polymorphims:      
GSTT1      P = 0.07
Null 17.9% 18.9% n = 112 16.9% n = 100  
Wildtpe 82.1% 81.1% n = 482 83.1% n = 492  
GSTM1      P = 0.72
Null 41.1% 41.1% n = 244 41.0% n = 243  
Wildtype 58.9% 58.9% n = 350 59.0% n = 349  
GSTP1      P = 0.07
AA 53.8% 53.5% n = 313 54.1% n = 318  
AG 38.7% 40.3% n = 236 37.1% n = 218  
GG 7.5% 6.2% N = 36 8.8% n = 52