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Table 1 Patient characteristics at baseline

From: Hypo- and hypercapnia predict mortality in oxygen-dependent chronic obstructive pulmonary disease: a population-based prospective study

Characteristic All patients, n = 2,249
Age, years 74.7 ± 8.2
Male/female gender 921/1328
PaO2 (air), kPa 6.5 ± 0.9
PaCO2 (air), kPa 6.3 ± 1.2
PaO2 (oxygen), kPa 8.7 ± 1.1
PaCO2 (oxygen), kPa 6.5 ± 1.3
FEV1 0.71 (0.6 - 1.0)
Known ever to smoke, n (%) 2.106 (94)
Body mass index, n (%)  
  < 18.5 280 (13)
  18.5 – 24.9 1397 (62)
  25 – 29.9 338 (15)
  ≥ 30 234 (10)
WHO performance status, n (%)  
  0 132 (6)
  1 881 (39)
  2 714 (32)
  3 292 (13)
  4 31 (1)
  Missing 199 (9)
Cardiovascular diagnoses, n (%)  
  0 755 (34)
  1 823 (37)
  2 449 (20)
  >2 222 (10)
  1. Data presented as mean ± SD unless otherwise specified. Hospitalizations and diagnoses were assessed within the four-year period before the start of long-term oxygen therapy (LTOT).
  2. Median (first quartile – third quartile).
  3. Abbreviations: FEV1, forced expiratory volume in one second.