Table 4. Longitudinal prevalence of diarrhoea stratified by reported last time of use.

	Mean longitudinal prevalence of diarrhoea						LPR (95% CI)
	Control			Intervention
	Weeks of illness	Person-weeks of observation	% weeks ill	Weeks of illness	person-weeks of observation	% weeks ill
8 months
User	71	2475	2.87	74	3155	2.35	0.82 (0.59; 1.13)
Non-user	68	2420	2.81	41	1319	3.11	1.11 (0.75; 1.62)
14 months
User	102	3463	2.95	99	3894	2.54	0.86 (0.66; 1.10)
Non-user	49	1642	2.98	27	1025	2.63	0.88 (0.55; 1.40)