Table 4.

Predicted ORs for diarrhea and bootstrap 95% CIs associated with unimproved water and sanitation at rainfall endpoints (from December of 2008 to May of 2009)

	1 Day of extreme rainfall*		5 Days of extreme rainfall*
	OR†	95% CI	OR†	95% CI
Households with an unimproved water source	1.35	0.13–5.09	6.81	1.87–24.51
Households with unimproved sanitation	2.93	1.30–6.64	1.28	0.74–2.16

^*Extreme rainfall days are defined using a threshold equivalent to the 90th percentile of the daily rainfall distribution (> 18 mm) and summed over the 5 weeks before the end of the 15-day case control period.

^†Adjusted for children under 5 years, household population, household ownership, and improved sanitation or water source.