Estimating the Effectiveness of Health-Risk Communications with Propensity-Score Matching: Application to Arsenic Groundwater Contamination in Four US Locations

Table 3

Marginal effects from probit regressions on two reduced form models (basic and expanded) of point-of-use filter use among survey respondents in regions with arsenic contamination of groundwater.

	Basic reduced form		Expanded reduced form
	Marg. eff.	S.E.	Marg. eff.	S.E.
	0.278***	0.094	0.188*	0.114
	0.033	0.074	−0.081	0.092
	−0.027	0.085	−0.012	0.091
	0.173**	0.076	0.096	0.086
EDU			0.017	0.014
AGE			−0.001	0.003
INCOME/10,000			0.015	0.009
			0.038	0.083
			−0.161**	0.082
			0.316***	0.098
			0.280***	0.091
Number of observations	266		266
Adj-	0.032		0.123

Marginal effects of indicator variables calculated as a discrete change from 0 to 1.
The referent category is OK.
refer to statistical significance at less than or equal to 0.01, 0.05, and 0.1.