Predictors of bilateral internal mammary artery use based on patient demographics, hospital characteristics and annual surgeon CABG volume
| Variable | OR | 95% CI | p Value |
|---|---|---|---|
| Patient demographics* | |||
| Age | 0.96 | 0.96 to 0.96 | <0.001 |
| Female gender | 0.65 | 0.64 to 0.67 | <0.001 |
| Race (Caucasian) | 1.30 | 1.26 to 1.34 | <0.001 |
| Median household income national quartile | <0.001 | ||
| I ($1–24 999), % | Reference | ||
| II ($25 000–34 999), % | 1.03 | 0.99 to 1.06 | 0.112 |
| III ($35 000–44 999), % | 1.20 | 1.16 to 1.24 | <0.001 |
| IV (>$45 000), % | 1.48 | 1.44 to 1.53 | <0.001 |
| Provider characteristics | |||
| Hospital location (urban vs rural) | 1.32 | 1.26 to 1.39 | <0.001 |
| Teaching status (teaching vs non-teaching) | 1.02 | 0.99 to 1.04 | 0.059 |
| Hospital bed size | |||
| Small | Reference | ||
| Medium | 0.62 | 0.60 to 0.65 | <0.001 |
| Large | 0.62 | 0.60 to 0.64 | <0.001 |
| Annual surgeon CABG volume†‡ | |||
| Very low (<50) | Reference | ||
| Low (50–75) | 0.82 | 0.73 to 0.91 | <0.001 |
| High (75–100) | 0.89 | 0.80 to 0.99 | 0.032 |
| Very High (>100) | 0.99 | 0.90 to 1.08 | 0.793 |
Adjusted for age, gender, race, elective status, chronic heart failure, chronic lung disease, obesity, diabetes mellitus, renal failure.
*Area under receiver operator curve (c- statistic)= 0.67.
†The multivariate analysis was performed only in patients with annual surgeon CABG volume available.
‡Area under receiver operator curve (c- statistic)=0.67.
CABG, coronary artery bypass grafting.