Table 3. Univariate and multivariate analysis of factors affecting EBUS-TBNA diagnostic yield.

Factors	Univariate analysis				Multivariate analysis
	OR	95% CI	P value		OR	95% CI	P value
Needle size (21- vs. 22-G)	0.06	0.02–0.26	<0.001		0.01	0.002–0.09	<0.001
Specimen preparation (core-tissue vs. cytology slides with ROSE vs. cytology without ROSE vs. cell-block vs. cell-block + cytology slides)	1.13	0.90–1.41	0.28
Center (Milan vs. Bergamo vs. Varese vs. Brescia vs. Verona)	0.60	0.45–0.81	<0.001		1.70	0.92–3.14	0.09

OR, odds ratio; CI, confidence interval.