Table 4.

Total Cost Regression Results with Inverse Gaussian Distribution and the Square Root Link from the Implementation Trial^* (N = 1,558 patients)

Variable	Parameter Estimate	Parameter Estimate 95% Confidence Interval	p-value
Implementation site	0.5118	[−2.7778, 3.8013]	.7604
Preperiod total cost at site	0.0031	[0.0013, 0.0048]	.0007
Age	−0.1286	[−0.2328, −0.0244]	.0155
Male	5.8835	[−0.3469, 12.1138]	.0642
Married	−2.8296	[−6.7176, 1.0584]	.1537
Rural	−3.6195	[−6.1199, −1.1192]	.0045
Income	0.0899	[−0.1348, 0.3145]	.4330
Service connection 1%–49%†	−1.7729	[−4.6527, 1.1070]	.2276
Service connection ≥50%†	9.7574	[6.3844, 13.1304]	.0045

^*The Implementation Trial is described in more detail in Fortney et al. (2013).

^†Percent service connection represents the degree to which health problems caused or exacerbated by military service prevent the veteran from working.