Table 4.

The effects of bromoform, chlorodibromethane, and bromodichloromethane on risk of rectal cancer.

	Bromoform			Chlorodibromo-methane			Bromodichloro-methane			Chloroform
	OR	95% CI	p	OR	95% CI	p	OR	95%CI	p	OR	95%CI	p
Alcohol (1000 oz./month)	1.77	(1.16 – 2.70)	0.008	1.65	(1.10–2.47)	.005	1.68	(1.12–2.52)	0.012	1.63	(1.09 – 2.44)	0.018
Betacarotene (10,000 IU/month)	0.56	(0.41–0.76)	<0.001	0.65	(0.50–0.84)	0.001	0.64	(0.50–0.84)	0.001	0.64	(0.49–0.83)	<0.001
Total Calories (10,000/month)	1.22	(1.05–1.40)	0.005	1.27	(1.14–1.42)	<0.001	1.26	(1.13–1.42)	<0.001	1.27	(1.14–1.42)	<0.001
Tap water (liters)	0.94	(0.73–1.20)	0.601	1.07	(0.45–2.59)	0.880	0.99	(0.83–1.16)	0.900	1.05	(0.52–2.12)	0.887
THM estimate (ug/l)	1.20	(1.05–1.35)	0.007	1.16	(0.85–1.58)	0.173	0.93	0.82–1.13)	0.465	1.00	(0.93–1.09)	0.777
THM consumption (ug/day)	1.85	(1.25–2.74)	0.002	1.78	(1.00–3.19)	0.052	1.15	(1.00–1.32)	0.047	1.00	(0.98–1.02)	0.908

"THM estimate" and "THM consumption" refer to the effects of individual THM components specified in each column.