Table 4.

Number and percent of stored drinking water samples contaminated with Escherichia coli, and median and range of Escherichia coli MPN/100 mL, among a random sample of intervention and control households at baseline, midterm, and endpoint of study

Sampling round	Intervention households (N = 24)		Control households (N = 24)
	Number (%) of samples with E. coli colonies	Median estimated E. coli MPN per 100 mL (min-max)	Number (%) of samples with E. coli colonies	Median estimated E. coli MPN per 100 mL (min-max)	P*
Baseline	23 (96%)	93 (0–36,582)	21 (88%)	219 (0–6,824)	0.22
Midterm	5 (21%)	0 (0–1,885)	22 (92%)	16 (0–1,221)	< 0.0001
Endpoint	2 (8%)	0 (0–292)	13 (54%)	1 (0–58)	0.002

^*Median estimated Escherichia coli counts between the intervention and control households were compared using the Wilcoxon 2-sample test.