Table 4.

Multivariate logistic regression model for false positive rate

Variable	OR (95% CI)	p-value
Site
Academic 1 vs Academic 2	2.43 (1.94 – 3.04)	<0.0001
Community vs Academic 2	0.91 (0.49 – 1.70)	0.66
Baseline	1.43 (1.19 – 1.72)	0.0002
Radiologist experience		0.001
Per 5 years	0.94 (0.91 – 0.98)
Range	0.59 (0.43 – 0.81)
Radiologist annual volume	0.86 (0.61 – 1.21)	0.39
Male Gender	1.10 (0.93 – 1.29)	0.27
Age		0.01
Per 10 years	1.19 (1.04 – 1.36)
Range	2.08 (1.16 – 3.72)
Smoking status	1	1
Emphysema	1.32 (1.12 – 1.57)	0.001
COPD	1.34 (1.13 – 1.60)	0.001
Median income by Zip code		0.01
Per $1,000	1.00 (0.99 – 1.00)
Range	0.43 (0.22 – 0.84)

CI, confidence interval.