Table 1.

Unadjusted associations between treatment received and outcome and between center preference and outcome

Event	Treatment Received					Center Preference Analysis
	On Pump		Off Pump		Risk Difference (%)a	On Pump		Off Pump		Risk Difference (%)b
	Patients and Events (n)	%	Patients and Events (n)	%		Patients and Events (n)	%	Patients and Events (n)	%
Overall cohort	584,348		158,561			265,497		26,904
death or RRT	11,665	2.0	2853	1.8	0.20	5029	1.9	461	1.7	0.18
death	7849	1.3	1970	1.2	0.10	3366	1.3	325	1.2	0.06
RRT	5724	1.0	1351	0.9	0.13	2450	0.9	201	0.7	0.18
eGFR ≥90	141,859		36,729			63,939		6060
death or RRT	1236	0.9	293	0.8	0.07	522	0.8	34	0.6	0.26
death	1006	0.7	244	0.7	0.04	422	0.7	28	0.5	0.20
RRT	408	0.3	80	0.2	0.07	165	0.3	10	0.2	0.09
eGFR 60–89	301,603		80,968			137,085		14,027
death or RRT	4025	1.3	950	1.2	0.16	1672	1.2	170	1.2	0.01
death	3186	1.1	772	1.0	0.10	1341	1.0	145	1.0	−0.06
RRT	1488	0.5	342	0.4	0.07	585	0.4	47	0.3	0.09
eGFR 30–59	133,129		37,959			60,890		6396
death or RRT	5160	3.9	1250	3.3	0.58	2308	3.8	215	3.4	0.43
death	3253	2.4	853	2.2	0.20	1443	2.4	138	2.2	0.21
RRT	2794	2.1	622	1.6	0.46	1258	2.1	109	1.7	0.36
eGFR 15–29	7757		2905			3583		421
death or RRT	1244	16.0	360	12.4	3.65	527	14.7	42	10.0	4.73
death	404	5.2	101	3.5	1.73	160	4.5	14	3.3	1.14
RRT	1034	13.3	307	10.6	2.76	442	12.3	35	8.3	4.02

^aNumber of patients with the outcome per 100 patients treated on pump minus number of patients with the outcome per 100 patients treated off pump.

^bNumber of patients with the outcome per 100 patients treated at centers with a preference for on-pump CABG (on-pump centers) minus the number of patients with the outcome per 100 patients treated at centers with a preference for off-pump CABG (off-pump centers).