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Table 1 Baseline characteristics

From: Psychometric properties and minimal important differences of SF-36 in Idiopathic Pulmonary Fibrosis

  n valid n missing mean / frequency sd / %
Age (in years) mean (sd) 258 0 67.3 10.7
Gender frequency (%) 258 0   
  male    189 73.3
Study site frequency (%) 258 0   
  Paris    73 28.3
  Giessen    153 59.3
  London    9 3.5
  Vienna    12 4.7
  Prague    3 1.2
  Napoli    1 0.4
  Budapest    6 2.3
Smoker frequency (%)     
  current or ever 248 10 181 73.0
Time since diagnosis (in years) mean (sd) 249 9 2.6 2.8
FVC (in percent of predicted) mean (sd) 258 0 62.7 19.8
DLCO (in percent of predicted) mean (sd) 228 30 41.8 18.8
6MWD (in meters) mean (sd) 181 77 403.1 120.1
LTOT frequency (%)     
  current 244 14 82 33.6
LTx frequency (%) 239 19   
  listed    3 1.3
  transplantated    4 1.7
SF-36 mean (sd)     
  PCS 232 26 34.6 10.5
  MCS 232 26 45.3 11.8
  GHP 250 8 40.3 18.4
  PFI 253 5 42.2 27.8
  ROLPH 247 11 30.2 40.5
  ROLEM 244 14 56.2 45.8
  SOCIAL 257 1 62.0 28.5
  MHI 250 8 62.5 21.3
  PAIN 255 3 65.1 28.2
  VITAL 253 5 40.0 18.9
BDI (range 0–12) frequency (%) 140 118   
  4    2 1.4
  5    3 2.1
  6    44 31.4
  7    48 34.3
  8    30 21.4
  9    10 7.1
  10    3 2.1
mMRC (range 1–5) frequency (%) 196 62   
  1    35 17.9
  2    61 31.1
  3    44 22.5
  4    27 13.8
  5    29 14.8
Modified NYHA scale (1–4) frequency (%) 229 29   
  1    23 10.0
  2    97 42.4
  3    95 41.5
  4    14 6.1
  1. Abbreviations: sd standard deviation, FVC forced vital capacity, DLCO Diffusing capacity of the lungs for carbon monoxide, 6MWD 6 min walking distance, LTOT Long-term oxygen therapy, LTx Lung transplantation, SF-36, BDI Baseline Dyspnoea Index, mMRC Modified Medical Research Council Dyspnea Scale, NYHA New York Heart Association