Table 1—

Subject demographics

Control groupScoliosis groupCOPD group
Subjects n101010
Males n10310
Age yrs61 (13)63.5 (6.0)65.0 (13.0)
Height/arm span m1.76 (0.9)1.62 (0.34)*,#1.75 (0.6)
Weight kg81.1 (13.8)57.9 (27.7)*,#86.3 (24.4)
BMI kg·m−226.0 (4.0)22.4 (9.1)*,#27.6 (5.9)
FFMI kg·m−218.0(2.3)14.9 (7.5)17.7 (1.9)
FEV1 % pred89.5 (33.0)35.3 (11.0)*26.5 (9.0)*
FVC % pred90.0 (20.0)44.0 (22.0)*73.0 (20.0)*
FEV1/FVC83.0 (15.0)80.1 (15.2)31.4 (16.6)*
Pa,O2 kPa9.1 (1.13)7.49 (1.71)
Pa,CO2 kPa5.73 (1.29)6.64 (0.88)
6MWD m300 (199)155 (180)
QMVC kg46.0 (17.0)21.5 (21.0)*31.5 (11.0)*
QMVC as % of BMI172 (48.4)106 (33.0)*115 (21.1)*
TwQ kg9.65 (3.0)5.9 (3.3)*6.5 (4.3)
  • Data are presented as median (interquartile range), unless otherwise stated. COPD: chronic obstructive pulmonary disease; BMI: body mass index; FFMI: fat-free mass index; FEV1: forced expiratory volume in 1 s; % pred: % predicted; FVC: functional vital capacity; Pa,O2: arterial oxygen tension; Pa,CO2: arterial carbon dioxide tension; 6MWD: 6-min walk distance; QMVC: quadriceps maximal voluntary contraction; TwQ: quadriceps twitch force. *: p<0.05 or smaller between patient group and control group; #: p<0.05 or smaller between restrictive and COPD group.