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Table 1 Baseline characteristics of total and propensity score-matched patients

From: Association between oxygen saturation level during bronchoscopy and post-bronchoscopy adverse events: a retrospective cohort study

  Total population Propensity score-matched population
High oxygen saturation group (n = 458) Low oxygen saturation group (n = 111) P-value High oxygen saturation group (n = 222) Low oxygen saturation group (n = 111) Standardized differences
Age, yr, mean (± SD) 66.9 (13.9) 67.0 (14.7) 0.963 66.4 (15.2) 67.0 (14.7) 0.038
Female, n (%) 146 (31.9) 43 (38.7) 0.206 80 (36.0) 43 (38.7) 0.056
Body mass index, mean (± SD) 21.3 (4.2) 22.4 (4.2) 0.013 22.0 (4.7) 22.4 (4.2) 0.087
Smoking status       
 Current smoker, n (%) 86 (18.8) 18 (16.2) 0.624 38 (17.1) 18 (16.2) 0.024
 Ex-smoker, n (%) 124 (27.1) 25 (22.5) 0.391 52 (23.4) 25 (22.5) 0.021
 Never smoker, n (%) 240 (52.4) 68 (61.3) 0.115 129 (58.1) 68 (61.3) 0.064
 PYs, median (IQR) 0 (0–30) 0 (0–20) 0.120 0 (0–20) 0 (0–20) 0.015
Comorbidities, n (%)       
 Hypertension 182 (39.7) 43 (38.7) 0.932 86 (38.7) 43 (38.7)  < 0.001
 Diabetes mellitus 128 (27.9) 24 (21.6) 0.218 51 (23.0) 24 (21.6) 0.032
 Congestive heart failure 51 (11.1) 19 (17.1) 0.119 32 (14.4) 19 (17.1) 0.074
 Arrhythmia 19 (4.1) 5 (4.5) 1.000 11 (5.0) 5 (4.5) 0.021
 Cerebrovascular accident 88 (19.2) 15 (13.5) 0.207 32 (14.4) 15 (13.5) 0.026
 Chronic kidney disease 32 (7.0) 10 (9.0) 0.597 13 (5.9) 10 (9.0) 0.120
 Chronic liver disease 25 (5.5) 9 (8.1) 0.405 9 (4.1) 9 (8.1) 0.170
 Connective tissue disease 13 (2.8) 3 (2.7) 1.000 5 (2.3) 3 (2.7) 0.029
 Dementia 43 (9.4) 5 (4.5) 0.141 21 (9.5) 5 (4.5) 0.195
 History of other malignancy 80 (17.5) 23 (20.7) 0.508 37 (16.7) 23 (20.7) 0.104
Respiratory disease, n (%)       
 Chronic obstructive pulmonary disease 81 (17.7) 14 (12.6) 0.253 28 (12.6) 14 (12.6)  < 0.001
 Bronchiectasis 133 (29.0) 28 (25.2) 0.495 54 (24.3) 28 (25.2) 0.021
 Asthma 15 (3.3) 3 (2.7) 0.994 10 (4.5) 3 (2.7) 0.096
 Interstitial lung disease 13 (2.8) 3 (2.7) 1.000 5 (2.3) 3 (2.7) 0.029
 Tuberculosis destroyed lung 84 (18.3) 9 (8.1) 0.013 22 (9.9) 9 (8.1) 0.063
 Nontuberculous mycobacteria 14 (3.1) 5 (4.5) 0.640 7 (3.2) 5 (4.5) 0.070
 History of lung cancer 35 (7.6) 4 (3.6) 0.193 19 (8.6) 4 (3.6) 0.208
 History of lung resection 12 (2.6) 3 (2.7) 1.000 7 (3.2) 3 (2.7) 0.027
 History of thoracic radiation therapy 15 (3.3) 1 (0.9) 0.299 7 (3.2) 1 (0.9) 0.160
  1. Data are expressed as mean (± standard deviation), median (IQR), or number (percentage)
  2. PYs pack-years; SD standard deviation; IQR interquartile range