Arsenic concentration (μg/l) | |||||
0⩽10 | 11⩽50 | 51⩽100 | 101–400 | Total* | |
Smokers | |||||
Cases, n (%) | 269 (12.0) | 1062 (47.4) | 163 (7.3) | 745 (33.3) | 2239 (100.0) |
Referents, n (%) | 117 (15.9) | 368 (50.1) | 51 (6.9) | 199 (27.1) | 735 (100.0) |
OR† | 1 | 1.25 | 1.37 | 1.65 | |
95% CI | – | 0.96 to 1.62 | 0.92 to 2.03 | 1.25 to 2.18 | |
Non-smokers | |||||
Cases, n (%) | 85 (16.5) | 241 (46.7) | 45 (8.7) | 145 (28.1) | 516 (100.0) |
Referents, n (%) | 69 (15.8) | 208 (47.5) | 33 (7.5) | 128 (29.2) | 438 (100.0) |
OR‡ | 1 | 0.90 | 1.10 | 0.94 | |
95% CI | – | 0.62 to 1.33 | 0.62 to 1.96 | 0.62 to 1.41 |
*Six cases and four referents had missing data on arsenic concentration; 50 cases and six referents had missing data on smoking habit; †adjusted for amount smoked (⩽20 units, >20 units), use of bidi (yes, no) and age; ‡adjusted for age.