. 2012 Aug;23(8):1389–1397. doi: 10.1681/ASN.2012020122

Table 3.

Conventional and instrumental variable estimates of the risk difference (on pump minus off pump) associated with on-pump versus off-pump CABG

Event	Estimated Risk Difference per 100 Patients (95% CI)
Event	Conventional Unadjusted	Conventional Propensity Weighted^a	Unadjusted Center Preference Analysis	Adjusted Center Preference Analysis
Overall cohort
death or RRT	0.20 (0.12, 0.27)^b	0.28 (0.21, 0.36)^b	0.18 (0.02, 0.34)^c	0.03 (−0.21, 0.26)
death	0.10 (0.04, 0.16)^d	0.15 (0.09, 0.21)^b	0.06 (−0.08, 0.20)	−0.07 (−0.27, 0.13)
RRT	0.13 (0.08, 0.18)^b	0.18 (0.13, 0.24)^b	0.18 (0.07, 0.29)^d	0.13 (−0.03, 0.29)
eGFR ≥90
death or RRT	0.07 (−0.03, 0.18)	0.05 (-0.06, 0.16)	0.26 (0.06, 0.46)^d	0.10 (−0.21, 0.41)
death	0.05 (−0.05, 0.14)	0.04 (-0.06, 0.13)	0.20 (0.02, 0.38)^c	0.08 (−0.20, 0.36)
RRT	0.07 (0.02, 0.13)^c	0.05 (-0.01, 0.11)	0.09 (−0.02, 0.20)	0.08 (−0.06, 0.23)
eGFR 60–89
death or RRT	0.16 (0.08, 0.25)^b	0.14 (0.05, 0.23)^d	0.01 (−0.18, 0.20)	−0.26 (−0.57, 0.06)
death	0.10 (0.03, 0.18)^c	0.09 (0.02, 0.17)^c	−0.06 (−0.23, 0.12)	−0.28 (−0.57, 0.00)
RRT	0.07 (0.02, 0.12)^d	0.05 (−0.00, 0.11)	0.09 (−0.01, 0.19)	0.01 (−0.17, 0.19)
eGFR 30–59
death or RRT	0.58 (0.38, 0.79)^b	0.66 (0.45, 0.87)^b	0.43 (−0.04, 0.90)	0.28 (−0.38, 0.94)
death	0.20 (0.03, 0.37)^c	0.30 (0.12, 0.47)^b	0.21 (−0.16, 0.59)	0.16 (−0.34, 0.65)
RRT	0.46 (0.31, 0.61)^b	0.47 (0.31, 0.62)^b	0.36 (0.03, 0.70)^c	0.22 (−0.32, 0.75)
eGFR 15–29
death or RRT	3.65 (2.20, 5.10)^b	3.66 (2.14, 5.18)^b	4.73 (1.64, 7.82)^d	4.60 (0.53, 8.68)^c
death	1.73 (0.90, 2.56)^b	1.92 (1.06, 2.78)^b	1.14 (−0.70, 2.98)	−0.36 (−3.60, 2.88)
RRT	2.76 (1.41, 4.11)^b	2.79 (1.37, 4.20)^b	4.02 (1.17, 6.87)^c	4.49 (1.07, 7.91)^d

Inverse probability weighted estimates after balancing treatment groups using propensity score.

P value <0.001.

P value <0.05.

P value <0.01.