Table 3.

Poisson and Ordinary Least Squares Regression Models for Number of Emergency Medical Services (EMS) Episodes among Those That Had at Least One EMS Episode (N=526)

Variable	Poisson Regression					Ordinary Least Squares Regression
	Coefficient	Robust Std Error	z	P Value	95% CI	Coefficient	Robust Std Error	t	P Value	95% CI
Poisson Regression: Log pseudolikelihood = −804.365; Wald Chi2 = 45.81; Prob. > Chi2 < .001; Pseudo R-squared = 0.026. OLS Regression: F(11, 514) = 3.75; Prob > F < 0.001; R-squared = 0.073; Root MSE = .533. Each regression model included only those independent variables that had bivariate associations with major depression of p=0.20 or less. Source for Cognitive Performance Scale (CPS) = Morris, et al., 1994.
Major Depression	.201	.101	1.99	.047	.003 - .399	.144	.069	2.08	.038	.008 - .281
West Virginia/Ohio	.144	.079	1.84	.066	−.010 - .299	.120	.053	2.26	.024	.016 - .225
Rural	−.131	.069	−1.91	.056	−.266 - .003	−.071	.048	−1.49	.138	−.165 -.023
Feels Close to 0-1 Relatives	−.151	.122	−1.24	.216	−.389 - .088	−.137	.072	−1.89	.059	−.279 - .005
Feels Close to 2-5 Relatives	−.212	.076	−2.77	.006	−.362 - −.062	−.130	.056	−2.33	.020	−.239 - −.020
Medicare Supplemental (Medigap) Insurance	.106	.078	1.37	.172	−.046 - .259	.070	.053	1.32	.188	−.034 -.176
Cognitive Performance Scale (CPS) score	.056	.023	2.40	.017	.010 -.102	.046	.016	2.89	.004	.015 - .078
Nurse intervention	−.239	.117	−2.03	.042	−.469 - −.009	−.125	.076	−1.64	.101	−.274 - .024
Voucher intervention	−.195	.100	−1.96	.050	−.390 - −.000	−.086	.071	−1.21	.225	−.226 - .054
Combination of Nurse and Voucher	−.104	.105	−0.99	.322	−.310 -.102	−.033	.072	−0.46	.645	−.176 -.109
Number of study days	.000444	.000125	3.55	<.001	.000 - .001	.000281	.000089	3.16	.002	.000106 - .000045
Constant	.364	.137	2.66	.008	.095 - .632	.210	.097	2.16	.031	.019 - .401