Table 1.

List of variables used in logistic regression for the cross-sectional survey of continued BSF use and the longitudinal prospective cohort study of the BSF in Bonao, Dominican Republic, from June to August of 2007

Variable	Variable type	Description
Access to sanitation	Binary	Access to latrine or toilet
Age	Binary	Participants were grouped as < 5 or ≥ 5 years of age
Categorical age	Ordinal	Participants were grouped as < 2, 2–4, and ≥ 5 years of age
Community	Binary	Brisas del Yuna or Jayaco
Drinking water source	Categorical	Responses were not mutually exclusive and included surface (river or canal), ground (well or spring), rain, piped (inside and outside), and bottled water
Sex	Binary	Participant's sex
Hand washing	Binary	Reported hand washing always with soap and water after defecating
Health education	Binary	Primary respondent received health education about preventing or treating diarrhea from any source
Household wealth	Dichotomous	Categorized (lower 40% or upper 60%) wealth score
Level of education	Binary	Primary respondent and spouse received primary education
Number of assets	Ordinal	Summary of the number of six household assets
Number of participants	Ordinal	Total number of household members
Payment for water	Binary	Any amount of payment for water by household
Perception of diarrhea	Binary	Primary respondent reported belief that diarrhea is an illness from which children can die
Safe storage practices	Binary	Use of covered or narrow-mouth water-storage container
Soap in the household	Binary	Presence of soap in the household
Time since installation	Binary	Installation group based on filter installation date
Time to water source	Categorical	Time to drinking water source: < 5, 5–9, 10–19, 20–39, or ≥ 40 minutes
Week	Categorical	Eight categories for the 8 study weeks: 1–8