Diarrhea prevalence in a randomized, controlled prospective trial of point-of-use water filters in homes and schools in the Dominican Republic

Table 2 Village characteristics

Variable	Before home filter installation (n = 394) Mean (SD) or %(x/n)	After home filter installation (n = 574) Mean (SD) or %(x/n)	p value for difference¹
Household size	4.60 (1.72)	4.41 (1.33)	0.049*
Region
North	38.8% (153/394)	35.0% (201/574)	0.004**
East	8.6% (34/394)	5.9% (34/574)
South	15.0% (59/394)	15.5% (89/574)
Capital–1	12.4% (49/394)	21.4% (123/574)
Capital–2	25.1% (99/394)	22.1% (127/574)
School filter status
Before/declined	82.0% (323/394)	68.6% (414/594)	< 0.001***
After	18.0% (71/394)	31.4% (180/594)
Season
Fall	67.3% (265/394)	19.2% (110/574)	< 0.001***
Winter	32.7% (129/394)	57.3% (329/574)
Spring	0.0% (0/394)	23.5% (135/574)
Water source
City	49.4% (195/394)	79.6% (457/574)	< 0.001***
Purchased	36.0% (142/394)	10.3% (59/574)
Well	10.4% (41/394)	8.5% (49/574)
Other	4.1% (16/394)	1.6% (9/574)

*p < 0.05; **p < 0.01, ***p < 0.00
¹ Logistic regression model with random effects term accounting for repeated measures

ISSN: 1349-4147