Table 6. Odds Ratios and 95% CIs for Gastric Cancer by Duration Unpiped Water Source.

	OR (95% CI)
Duration unpiped (years, # cases)	Unadjusted	Age-adjusted	Fully-adjusted model*
First quartile (0–31 years, n = 72)	1.00 (ref)	1.00 (ref)	1.00 (ref)
Second quartile (32–42 years, n = 70)	0.98 (0.66–1.46)	0.88 (0.58–1.33)	0.86 (0.54–1.38)
Third quartile (43–52 years, n = 68)	1.02 (0.68–1.51)	0.89 (0.58–1.36)	0.85 (0.51–1.41)
Fourth quartile (53+ years, n = 94)	1.44 (0.99–2.11)	1.21 (0.79–1.86)	1.48 (0.87–2.53)

*Adjusted for age, gender, ethnicity, marital status, education, head of household education, urban or rural place of birth and residence, home ownership, size of home, wealth score, vegetable consumption, and H. pylori seropositivity.