Table 2.

Association Between Heavy Rainfall Events^a and Diarrhea Incidence, According to Amount of Rainfall During the Previous 8 Weeks, Ecuador, 2004–2007

Total 8-Week Rainfallc	1-Week Lag				2-Week Lag
	Adjustedb		Unadjusted		Adjustedb		Unadjusted
	IRR	95% CI	IRR	95% CI	IRR	95% CI	IRR	95% CI
Low	0.95	0.67, 1.34	0.94	0.66, 1.32	1.39	1.03, 1.87	1.39	1.03, 1.87
Moderate	0.86	0.57, 1.30	0.85	0.56, 1.28	0.70	0.44, 1.11	0.70	0.44, 1.11
High	0.92	0.74, 1.13	0.91	0.74, 1.12	0.74	0.59, 0.92	0.73	0.59, 0.92

Abbreviations: CI, confidence interval; IRR, incidence rate ratio.

^a A heavy rainfall event was defined as maximum 24-hour rainfall above the 90th percentile value (56 mm) during a 1-week period. Estimates were modeled using random-effects Poisson regression, with a random intercept for each village.

^b Results were adjusted for diarrhea incidence during the prior week and remoteness (cost and duration of travel to the nearest city, scaled so that the most remote village had a value of 1).

^c Total rainfall during the previous 8 weeks, defined as low (78–425 mm), moderate (426–604 mm), or high (605–1,356 mm) on the basis of the 33rd and 66th percentile values.