Table 4. Relationship of variables with false positive nodules.

A. Univariate analysis.
	Baseline		P value	Follow-up	p value
	OR (95 CI%)			OR (95% CI)
Bronchiectasis	1.73 (1.22–2.45)		0.002	1.55 (1.002–2.41)	0.049
Current smokers	1.009 (0.75–1.35)		0.949	1
Airflow	1.94 (1.31–2.87)		0.001	0.72 (2.51e-18-2.07e+17	0.987
limitation*
B. Multivariable analysis to assess false positives on follow-up studies**.
Variable	OR	Std. Err.	z	P>|z|	95% CI
Airflow	1.86	0.376	3.11	0.002	1.25–2.77
limitation*
Bronchiectasis	1.57	0.323	2.21	0.027	1.05–2.435

Abbreviations: OR: odds ratio; 95%CI: 95% confidence interval.

*Airflow limitation at the end of the follow up period.

** Adjusted for bronchiectasis.