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. Author manuscript; available in PMC: 2020 Jan 22.
Published in final edited form as: Circulation. 2019 Jan 22;139(4):458–472. doi: 10.1161/CIRCULATIONAHA.117.033325

Table 5:

Outcomes by operator volume and overall experience

In-hospital mortality 1-year post-discharge mortality 1-year post-discharge MACE
Unadjusted HR (95% CI) Adjusted HR (95% CI) Unadjusted HR (95% CI) Adjusted HR (95% CI) Unadjusted HR (95% CI) Adjusted HR (95% CI)
Overall†
 High vs. low volume 0.77
(0.68–0.87)* 		0.76
(0.68–0.85)* 		1.10
(1.00–1.21)* 		1.04
(0.94–1.15)		 1.12
(1.04–1.21)* 		1.05
(0.97–1.14)
 Intermediate vs. low volume 0.92
(0.80–1.05)		 0.88
(0.78–0.99)* 		1.07
(0.96–1.18)		 1.01
(0.91–1.13)		 1.08
(0.99–1.17)		 1.02
(0.94–1.11)
0–1 years experience‡
 High vs. low volume 0.99
(0.69–1.43)		 1.02
(0.72–1.45)		 0.97
(0.75–1.20)		 0.94
(0.72–1.24)		 0.99
(0.79–1.23)		 0.98
(0.77–1.25)
 Intermediate vs. low volume 0.92
(0.63–1.34)		 0.95
(0.67–1.35)		 0.89
(0.66–1.20)		 0.83
(0.61–1.13)		 0.90
(0.70–1.16)		 0.87
(0.66–1.13)
2–4 years experience‡
 High vs. low volume 0.77
(0.59–1.00)* 		0.75
(0.60–0.95)* 		1.21
(0.99–1.49)		 1.12
(0.90–1.38)		 1.10
(0.94–1.29)		 1.02
(0.87–1.20)
 Intermediate vs. low volume 0.90
(0.68–1.19)		 0.83
(0.65–1.06)		 1.16
(0.93–1.45)		 1.15
(0.92–1.45)		 1.02
(0.86–1.21)		 1.00
(0.84–1.20)
> 4 years experience‡
 High vs. low volume 0.77
(0.66–0.90)* 		0.74
(0.64–0.85)* 		1.14
(1.02–1.28)* 		1.08
(0.95–1.22)		 1.19
(1.08–1.30)* 		1.10
(1.00–1.22)
 Intermediate vs. low volume 0.93
(0.79–1.10)		 0.88
(0.76–1.02)		 1.10
(0.97–1.25)		 1.03
(0.90–1.18)		 1.15
(1.04–1.27)* 		1.07
(0.97–1.19)
*

; p < 0.05;

†

, PCIs performed in 2014 only;

‡

, number of years active (performed at least 1 PCI) between 2009 and 2013

HR, hazard ratio; CI, confidence interval. Low-volume operators performed < 50 PCIs/year; intermediate-volume operators performed 50–100 PCIs/year; high-volume operators performed > 100 PCIs/year