Table 1

Clinical details of patients in study 1 (pre-breathing oxygen) and study 2 (oxygen during recovery)

Study 1 (n=34)Study 2 (n=18)
Mean (SD)RangeMean (SD)Rangep value*
FEV1=forced expiratory volume in 1 second; Pao2=arterial oxygen tension; Sao2=oxygen saturation.
*Study 1 v study 2.
Age (years)68 (5.98)58–8168 (6.87)58–81NS
FEV1 (litres)0.88 (0.34)0.44–1.730.73 (0.17)0.44–1.10NS
FEV1 (% predicted)34 (13.1)18–5829 (6.1)19–400.045
Pao2 (kPa) resting, on air7.71 (1.45) (n=22)5.14–10.507.68 (1.37) (n=16)4.66–10.50NS
Sao2 (%) resting, on air91.9 (5.2)76–9790.5 (5.8)76–97NS
Walk distance on air (m)283 (117.8)70–490233 (88.6)90–410NS