Table 3.

Relative risk estimates for water contact by activity.

Month	Prevalence	Relative Risk	95% CI	Std. error	p-value
Tool washing	0.20	1.03	(1.01, 1.05)	0.01	< 0.01
Laundry	0.22	1.02	(1.00, 1.05)	0.01	0.08
Swimming	0.21	1.02	(1.00, 1.05)	0.01	0.10
Ditch digging	0.48	0.99	(0.98, 1.00)	0.01	0.16
Fishing	0.02	1.01	(1.00, 1.02)	0.01	0.17
Bathing	0.49	0.98	(0.92, 1.04)	0.03	0.46
Rice planting	0.65	1.03	(0.94, 1.13)	0.05	0.52

These estimates are based on a main-effects log-linear regression, and are also adjusted for age category and village. The relative risks reflect the difference in risk of infection between exposure at the mean value for that month and zero exposure.