Table 1.

Results of multivariate logistic regression analysis used to create the propensity score model.

Data Variables	Reference Level	Estimate	Odds Ratio			p-value
			Ratio	95% Confidence Limits
Intercept	–	−1.55	–	–	–	.0001
Age	Continuous	−.006	.99	.98	1.00	.22
Gender	Female	−.03	.97	.76	1.24	.81
Lesion Size	Continuous	−.01	.98	.98	1.00	.01
Lesion Location – LLL	RUL	−.09	.91	.61	1.36	.65
Lesion Location – LUL	RUL	−.34	.71	.50	1.00	.05
Lesion Location – RLL	RUL	−.06	.94	.65	1.37	.74
Lesion Location – RML	RUL	.02	1.02	.59	1.76	.94
Needle Path Length	Continuous	.005	1.01	1.00	1.01	.12
Biopsy Type – FNA	Core	−1.56	.21	.10	.43	< .0001
Emphysema – Yes	No	.94	2.55	1.88	3.45	< .0001
Number of Visceral Pleural Surfaces Crossed	Continuous	.20	1.23	.95	1.59	.11
Patient Position – Supine	Prone	−.63	.53	.27	1.04	.06
Patient Position – Decubitus	Prone	.25	1.29	.64	2.60	.48
Biopsy Approach – Anterior	Posterior	.58	1.78	.89	3.54	.10
Biopsy Approach – Lateral	Posterior	.75	2.11	1.22	3.65	.007

RUL: right upper lobe; LUL: left upper lobe; RML: right middle lobe; LLL: left lower lobe; RLL: right lower lobe; FNA: fine needle aspirate