TABLE 1. Odds Ratios and 95% Confidence Intervals for Adenocarcinoma of the Distal Stomach and Esophagus and Nitrate Concentrations in Nebraska Public Water Supplies (1965–1984)^a.

	Stomach Cancer				Esophagus Cancer
	Controls	Cases	ORb	(95% CI)	Cases	ORc	(95% CI)
Nitrate in drinking water
Years >10 mg/L nitrate-N
0	218	54	1.0		57	1.0
1–8	55	12	1.0	(0.5–2.0)	12	0.8	(0.4–1.8)
9+	48	13	1.1	(0.5–2.3)	15	0.9	(0.4–1.9)
P for trend:			0.672			0.384
Average nitrate level 1965–1984 (mg/L nitrate-N)
<2.45	80	17	1.0		17	1.0
2.45–<2.58	80	29	2.1	(1.0–4.4)	27	2.1	(1.0–4.6)
2.58–4.32	80	16	1.2	(0.5-2.6)	21	1.2	(0.5–2.7)
>4.32	81	17	1.2	(0.5–2.7)	19	1.2	(0.6–2.7)
P for trend			0.946			0.519

^aIncludes those with 70% or more of their person-years after 1964 with Nebraska public water supply nitrate estimates;

^bOdds ratios adjusted for year of birth, gender, education, smoking, alcohol;

^cOdds ratios adjusted for year of birth, gender, body mass index, smoking, alcohol.