Table 2 CT findings

 Subglottic trachea^a

21/38 (55%)

18/23 (78%)

3/15 (20%)

14.40 [3.22; 85.07]

0.001

 Cervical trachea

27/45 (60%)

16/26 (62%)

11/19 (58%)

1.16 [0.34; 3.92]

0.838

 Thoracic trachea

17/45 (38%)

5/26 (19%)

12/19 (63%)

0.14 [0.03; 0.51]

0.009

 Main bronchi

21/45 (47%)

10/26 (38%)

11/19 (58%)

0.45 [0.13; 1.50]

0.278

 Lobar bronchi

20/45 (44%)

10/26 (38%)

10/19 (53%)

0.56 [0.17; 1.85]

0.430

 Distal bronchi

23/45 (51%)

12/26 (46%)

11/19 (58%)

0.62 [0.18; 2.04]

0.515

Extensive involvement

15/45 (33%)

4/26 (15%)

11/19 (58%)

0.13 [0.03; 0.50]

0.009

 Trachea

33/45 (73%)

20/26 (77%)

13/19 (68%)

1.54 [0.40; 5.96]

0.597

 Bronchi

23/45 (51%)

11/26 (42%)

12/19 (63%)

0.43 [0.12; 1.41]

0.244

 Sparing the posterior tracheal membrane

14/45 (31%)

3/26 (12%)

11/19 (58%)

0.09 [0.02; 0.39]

0.003

 Irregular

8/45 (18%)

7/26 (27%)

1/19 (5%)

6.63 [1.03; 130.49]

0.090

 Trachea

14/45 (31%)

8/26 (31%)

6/19 (32%)

0.96 [0.27; 3.56]

0.962

 Main/lobar bronchi

17/45 (38%)

7/26 (27%)

10/19 (53%)

0.33 [0.09; 1.13]

0.138

 Distal bronchi

15/45 (33%)

9/26 (35%)

6/19 (32%)

1.15 [0.33; 4.20]

0.859

Tracheal calcifications

15/45 (33%)

5/26 (19%)

10/19 (53%)

0.21 [0.05; 0.78]

0.045

Tracheobronchomalacia

10/20 (50%)

1/5 (20%)

9/15 (60%)

0.17 [0.01; 1.47]

0.148

Bronchiectasis

14/45 (31%)

9/26 (35%)

5/19 (26%)

1.48 [0.41; 5.78]

0.619

Mosaic perfusion

35/45 (78%)

18/26 (69%)

17/19 (89%)

0.26 [0.04; 1.24]

0.159

Air trapping

15/20 (75%)

3/5 (60%)

12/15 (80%)

0.38 [0.04; 3.80]

0.441

Pulmonary nodule

7/45 (16%)

6/26 (23%)

1/19 (5%)

5.40 [0.81; 107.21]

0.146

Pulmonary consolidation

5/45 (11%)

4/26 (15%)

1/19 (5%)

3.27 [0.44; 67.10]

0.352