Table 3.

Adjusted Rate Ratios for the Change in Monthly Referral Rates over Time

	All Clinics^*	P	By Clinic Group^*^{^†}	P
Monthly referral rate ratio	1.002 (1.001, 1.003)	<0.001	1.000 (0.999, 1.001)	0.607

↵* Adjusted for encounter length, race, and insurance payer.
↵† Model included a term for the interaction between time and high/medium/low referral clinic clusters.