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Table 1 Characteristics of patients

From: Predictive risk factors for pneumothorax after transbronchial biopsy using endobronchial ultrasonography with a guide sheath

Characteristics Total No pneumothorax Pneumothorax
n = 916 n = 886 n = 30
Age
 Median (IQR) 72 (65–77) 71 (65–77) 71 (60–74)
  ≥ 75 years 325 (35.2%) 313 (35.3%) 11 (36.7%)
Sex
 Male 609 (66.5%) 590 (66.6%) 19 (63.3%)
 Female 307 (33.5%) 296 (33.4%) 11 (36.7%)
Smoking status
 Current 230 (25.1%) 222 (25.2%) 8 (26.7%)
 Ex 628 (68.6%) 608 (68.5%) 13 (43.3%)
 Never 58 (6.3%) 56 (6.3%) 9 (30.0%)
Pulmonary co-morbidities
 Emphysema* 236 (25.8%) 227 (25.6%) 10 (33.3%)
 Fibrosis 129 (14.1%) 122 (13.9%) 7 (23.3%)
 Post-surgery 24 (2.6%) 24 (2.7%) 0 (0%)
 Other lung diseases** 88 (9.6%) 83 (9.4%) 5 (16.7%)
 Steroid use 35 (3.8%) 35 (3.9%) 0 (0%)
Guide sheath used
 Large (outer diameter 2.55 mm) 157 (17.1%) 155 (17.4%) 3 (10.0%)
 Small (outer diameter 1.95 mm) 759 (82.9%) 731 (82.5%) 27 (90.0%)
  1. *Confluent emphysema and advanced destructive emphysema [13]
  2. **Other lung diseases, including bronchial asthma, sequelae of tuberculosis, bronchiectasis, sarcoidosis, pulmonary non-Mycobacterium tuberculosis infection, and pneumoconiosis