Table 1.

Results of the meta-regression model for water supply interventions

	Improved source, not on premises	Improved source, on premises	Improved source, on premises, higher water quality*	Improved source, on premises, continuous supply†	POU chlorination	POU solar treatment	POU filtration
Unimproved
RR (95% CI)	0·81 (0·70–0·94)	0·79 (0·60–1·03)	0·48 (0·26–0·87)	0·73 (0·37–1·44)	0·66 (0·56–0·77)	0·63 (0·50–0·80)	0·50 (0·41–0·60)
p value	0·0060	0·076	0·017	0·36	<0·0001	0·0002	<0·0001
Improved, not on premises
RR (95% CI)	..	0·97 (0·75– 1·25)	0·59 (0·32– 1·07)	0·90 (0·46–1·77)	0·81 (0·68–0.95)	0·78 (0·63– 0·96)	0·61 (0·49– 0·75)
p value	..	0·79	0·081	0·75	0·012	0·023	<0·0001
Improved, on premises
RR (95% CI)	..	..	0·61 (0·35– 1·05)	0·93 (0·50– 1·74)	..	..	..
p value	..	..	0·072	0·82	..	..	..

Results are adjusted for combined intervention (RR 0·89 [95% CI 0·74–1·08]). POU=point-of-use. RR=relative risk.

^*Based on two studies.^{24, 34}

^†Based on one study.³⁵