Table 3.

Model estimations of reduction in knee arthroscopy in intervention hospitals (vs. control hospitals^a, public only)

	Point estimates	95% CI		p-value	Incidence rate ratio
Intervention	0.08	−0.23	0.38	0.630
Time	−0.13	−0.40	0.13	0.323
Intervention a Time	−0.82	−1.52	−0.12	0.022	0.44 (0.21–0.89)

^aControl hospitals were matched by volume of knee arthroscopy, and one intervention matches with four controls