Table 5.

Adjusted odds ratio of E. coli contamination for the intervention and comparison group in stored water, adjusting for demographic factors and chlorination, hollow fiber ultrafilter evaluation, Kenya, March 2010–April 2011

	aOR (95% CI)	P-value
Treatment group
Intervention (hollow fiber ultrafilter)	0.42 (0.24, 0.74)	0.002
Comparison (customary treatment)	Referent
Respondent age (years)	1.00 (0.97, 1.03)	0.92
Education
≥ Primary school	1.05 (0.63, 1.73)	0.86
< Primary school	Referent
Water source
Improved	0.37 (0.23, 0.59)	< 0.001
Unimproved	Referent
Observed chlorination in stored drinking water
Positive	0.34 (0.13, 0.93)	0.03
Negative	Referent

aOR = adjusted odds ratio; E. coli = Escherichia coli.