Table 5.

Adjusted Cox proportional hazard regression—with clustering (random effect for physician)

	HR	95% CI	P value
Intervention	1.32	(1.10 to 1.58)	0.003
Male sex	0.95	(0.79 to 1.15)	0.62
Patient age	1.00	(0.99 to 1.01)	0.99
Insurance
Private (ref.)
Medicare	1.28	(1.02 to 1.61)	0.03
Medicaid	1.27	(1.03 to 1.56)	0.03
Other	2.07	(1.23 to 3.47)	0.006