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The effects of THMs (Total 551) and covariates on risk of rectal cancer
| Variable | OR | 95% Confidence Interval | p |
| Alcohol (1000 oz./month) | 1.64 | (1.09 – 2.47) | 0.018 |
| Betacarotene (10,000 IU/month) | 0.58 | (0.43 – 0.78) | <0.001 |
| Total Calories (10,000/month) | 1.18 | (1.02–1.36) | 0.022 |
| Tap water (liters) | 1.05 | (0.67–1.84) | 0.831 |
| Total 551 estimate (ug/l) | 1.01 | (0.98–1.03) | 0.518 |
| Total 551 consumption (ug/day) | 1.01 | (0.99–1.03) | 0.330 |
