Table 3:
Adjusted odds ratios for skin lesions by category of arsenic exposurea.
| Arsenic exposure | All Subjects | Residents exposed since before 1995 | Residents exposed since before 1985 | Hand pump well users |
|---|---|---|---|---|
| Odds Ratio 95% CI P-value Number | Odds Ratio 95% CI P-value Number | Odds Ratio 95% CI P-value Number | Odds Ratio 95% CI P-value Number | |
| 0–5 μg/L | Ref
3 215 |
Ref
1 678 |
Ref
477 |
Ref
2 318 |
| 5.1–10 μg/L | 2.52
1.47,4.30 <0.01 845 |
2.34
1.21,4.51 0.01 411 |
2.08
0.70,6.20 0.19 128 |
1.90
1.08–3.36 0.03 727 |
| 10.1–20 μg/L | 2.83
1.773,4.525 <0.01 1 277 |
2.45
1.35,4.44 <0.01 663 |
3.18
1.36,7.45 <0.01 235 |
2.12
1.28–3.54 <0.01 1 080 |
| 20.1–50 μg/L | 3.94
2.78,5.59 <0.01 3 429 |
3.31
2.20,4.98 <0.01 1 862 |
2.44
1.10,5.43 0.03 316 |
2.83
1.84–4.35 <0.01 1 558 |
| 50.1–100 μg/L | 6.03
4.05,8.97 <0.01 1 537 |
5.38
3.31,8.75 <0.01 667 |
3.62
1.57,8.33 0.003 226 |
4.01
2.62–6.14 <0.01 1 381 |
| 100.1–300 μg/L | 8.83
5.77,13.51 <0.01 1 021 |
10.38
6.06,17.77 <0.01 407 |
8.99
4.15,19.46 <0.01 155 |
6.59
4.28–10.11 <0.01 1 013 |
| >300 μg/L | 7.94
2.73,23.12 <0.01 92 |
12.64
3.209,49.822 <0.01 43 |
N/Ab | 5.92
2.04–17.17 <0.01 92 |
a) Adjusted odds ratios estimated from logistic regression, controlling for drinking, smoking, education, sex, farm work, income, well type and age.
b) Top two categories combined due to few numbers exposed over 300 μg/L.