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

Table 1

The prevalence of PACs by decades of life.

Decade of life	Number of subjects	Number of PACs	Prevalence (%)
0~19	82	2	2.4
20~29	113	3	2.65
30~39	265	5	1.88
40~49	654	35	5.35
50~59	1081	74	6.84
60~69	1034	94	9.09
70~79	828	53	6.4
80~89	452	41	9.07
90~109	64	4	6.25
Total	4573	311	6.8

PACs = paratracheal air cysts.