Table 3.

Effect of Gamma Regression on Primary Care Visits

Characteristics	DF	Chi square statistic^*
Service agreement (SA)	1	87.3^{^‡}
Female	1	4.7
Female × SA	1	4.3^{^†}
Age group	3	104.3^{^‡}
Age group × SA	3	64.1^{^‡}
Education	2	34.5^{^‡}
Employed	1	30.2^{^‡}
Insured	1	1128.9^{^‡}
Comorbidity	1	13690.4^{^‡}

DF, degree of freedom; SA, service agreement.
↵* Gamma regression model was used to calculate the P values.
↵† P < .05;
↵‡ P < .01.