Table 3. Arithmetic and geometric means of water samples collected from adopters and non-adopters.

	n	Arithmetic mean (95% CI)	Geometric mean (95% CI)	p
Thermotolerant coliform (TTC) counts for household and source water †
Household	490	153.2 (134.8; 171.6)	24.8 (19.9; 30.8)	0.75
Source	33	144.6 (78.8; 210.4)	29.9 (13.0; 68.7)
Source water quality (TTC) by adoption status * †
Adopter	243	212.1 (188.4; 235.8)	65.3 (49.7; 85.8)	0.96
Non-adopter	247	213.4 (191.1; 235.7)	101.7 (82.4; 125.4)
Household water quality (TTC) by adoption status †
Adopter	243	118.4 (95.4; 141.3)	13.7 (9.9; 18.8)	0.01
Non-adopter	247	187.5 (159.3; 215.7)	44.5 (33.7; 58.8)
Household water quality (TTC) by water treatment method †
Confirmed Pureit use	186	86.6 (64.3; 108.8)	9.2 (6.5; 13.0)	ref
Other filter methods	72	93.4 (53.9; 133.1)	15.5 (9.3; 25.9)	0.79
Reported boiling	24	209.7 (130.3; 289.1)	55.0 (19.2; 157.0)	0.04
Unsafe or no method	208	227 (194.7; 259.3)	64.4 (47.7; 86.8)	<0.01
Log reduction in TTC from source to household by adoption status § *
Adopter	243	0.64 (0.47; 0.82)		0.24
Non-adopter	247	0.36 (0.21; 0.50)
Log reduction in TTC from source to household by water treatment method § *
Confirmed Pureit use	186	0.80 (0.61; 1.00)		ref
Other filter methods	72	0.87 (0.58; 1.17)		0.59
Reported boiling	24	0.18 (−0.29; 0.64)		0.04
Unsafe or no method	208	0.13 (−0.01; 0.28)		0.01

p values determined by

^§T-tests or

^†negative binomial regression.

“ref” refers to the referent group.

^* Variance adjusted for clustering at source water sample.