Baseline pre-operative characteristics of survivors (n=216) and patients who had died (n=21) at 90 days post lung volume reduction surgery

Age years60±762±860±70.310
BMI kg·m−223.4±4.221.8±5.323.3±4.30.110
MRC dyspnoea score4 (3–4)4.5 (3–5)4 (3–4)0.478
Received long-term oxygen therapy1317130.643
Received ambulatory oxygen162517
PaO2 kPa9.61±1.319.39±1.429.59±1.320.484
PaCO2 kPa5.28±0.655.18±0.835.27±0.830.557
FEV1 L0.81±0.340.67±0.340.79±0.340.068
FEV1 %28.7±10.323.5±5.928.3±10.10.024
FVC L2.53±0.861.94±0.472.48±0.850.002
FVC %72.4±18.463.0±20.271.5±18.70.028
TLC %143±17139±16142±170.326
RV %261±54260±46261±530.895
RV/TLC ratio %66±971±667±90.023
TLCO %39±1331±2038±140.016
KCO %49±1642±3348±180.146

Data are presented as mean±sd, % and median (interquartile range). BMI: body mass index; MRC: Medical Research Council; PaO2: partial pressure of arterial oxygen; PaCO2: partial pressure of arterial carbon dioxide; FEV1: forced expiratory volume in 1 s; FVC: forced vital capacity; TLC: total lung capacity; RV: residual volume; TLCO: transfer factor of the lung for carbon monoxide; KCO: transfer factor per unit alveolar volume.