Incidental Paratracheal Air Cysts on Thoracic CT and Their Association with Chronic Inflammatory Lung Disease

Table 4

Factors associated with an increase in PAC size.

Variables	Not increase in size of PACs ()	Increase in size of PACs ()	Univariable	Multivariable	Odds ratio (95% CI)
Age (mean ± SD)	64.63 ± 11.93	66.22 ± 13.45	0.460	0.901
Sex
Male	49 (65.3%)	40 (61.5%)	0.642	0.829
Female	26 (34.7%)	25 (38.5%)
Progression of upper lung fibrosis	13 (17.3%)	43 (66.2%)	<0.001	<0.001	8.785; (3.897–19.084)
Follow-up interval (month)	32 (15–46)	42 (24.5–71)	0.018	0.512

Note. All data except P values are presented as numbers (percentages) of patients.
PAC = paratracheal air cysts, CI = confidence interval, SD = standard deviation, and = number.