Table 3:

In-hospital mortality by operator volume

	Unadjusted HR (95% CI)	Adjusted HR (95% CI)
Overall
High vs. low volume	0.81 (0.77–0.87)*	0.79 (0.75–0.83)*
Intermediate vs. low volume	0.95 (0.89–1.01)	0.91 (0.86–0.96)*
STEMI only
High vs. low volume	0.90 (0.85–0.96)*	0.87 (0.82–0.92)*
Intermediate vs. low volume	0.92 (0.86–0.99)*	0.90 (0.84–0.95)*
UA/NSTEMI only
High vs. low volume	0.95 (0.87–1.05)	0.87 (0.80–0.95) *
Intermediate vs. low volume	1.02 (0.92–1.13)	0.98 (0.89–1.08)
Stable angina only
High vs. low volume	0.82 (0.55–1.22)	0.76 (0.51–1.12)
Intermediate vs. low volume	1.09 (0.72–1.65)	1.05 (0.69–1.58)
Chronic total occlusion
High vs. low volume	0.55 (0.45–0.67)*	0.71 (0.60–0.86)*
Intermediate vs. low volume	0.80 (0.66–0.98)*	0.86 (0.72–1.04)
Bifurcation lesion
High vs. low volume	0.78 (0.68–0.90)*	0.77 (0.67–0.88)*
Intermediate vs. low volume	0.91 (0.79–1.06)	0.89 (0.77–1.02)
Left main lesion
High vs. low volume	0.72 (0.57–0.91)*	0.73 (0.60–0.89)*
Intermediate vs. low volume	1.15 (0.91–1.46)	1.07 (0.87–1.31)

^*p < 0.05. MI, myocardial infarction; OR, odds ratio; CI, confidence interval; STEMI, ST segment elevation MI; UA, unstable angina; NSTEMI, non-ST segment elevation MI; CTO, chronic total occlusion. Low-volume operators performed < 50 PCIs/year; intermediate-volume operators performed 50–100 PCIs/year; high-volume operators performed > 100 PCIs/year