Table 1 Baseline characteristics of the study patients and treatments for IPF before the first admission for pneumothorax

Age, year

75.5 ± 5.4

Gender

 Male/female

29/7

Body mass index^a, kg/m²

18.5 ± 4.1

Preadmission of PFT

 FVC^b, L

1.6 ± 0.6

 FVC^b, % predicted

55.8 ± 16.5

 FEV₁^b, L

1.5 ± 0.5

 FEV₁^b, % predicted

66.2 ± 18.4

 FEV₁/FVC^b, %

91.7 ± 10.6

 DLco^c, mL/min/mmHg

8.3 ± 2.2

 DLco^c, % predicted

62.4 ± 14.9

Smoking status

 Current/former/never

1/25/10

Treatment for IPF at baseline

 Pirfenidone

4

 Nintedanib

3

 Corticosteroid

7

 Cyclosporine

4

 None

22

Long-term oxygen therapy

 Yes/no

9/27