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Table 1 Baseline characteristics (n = 65)

From: Relationship between peripheral airway function and patient-reported outcomes in COPD: a cross-sectional study

Characteristics Mean ± SD Range
Age (years) 71 ± 9 46 -- 87
Height (m) 1.65 ± 0.06 1.50 -- 1.80
Body mass index (kg/m2) 21.3 ± 2.7 15.42 -- 29.0
FEV1 (L) 1.64 ± 0.64 0.58 -- 3.42
FEV1 (%predicted) 58.8 ± 19.7 18.7 -- 100.8
RV/TLC (%) 42.9 ± 7.5 27.7 -- 59.4
DLCO/VA(ml/min/mmHg/L) 2.76 ± 1.06 0.69 -- 5.35
R20 (kPa/L/s) 0.24 ± 0.07 0.13 -- 0.41
R5-R20 (kPa/L/s) 0.09 ± 0.06 -0.02 -- 0.27
X5 (kPa/L/s) -0.15 ± 0.08 -0.48 -- -0.05
LAA (%) 20.4 ± 10.2 2.5 -- 44.5
WA (%) 57.1 ± 5.7 44.9 -- 71.6
SGRQ symptoms (0--100) 35.0 ± 20.5 0 -- 90.6
SGRQ activity (0--100) 41.2 ± 21.9 0 -- 92.5
SGRQ impact (0--100) 20.1 ± 15.9 0 -- 63.2
SGRQ total (0--100) 29.0 ± 16.4 1.6 -- 62.3
MRC (0--4) 1.1 ± 0.8 0 -- 4
HADS anxiety (0--21) 3.3 ± 3.0 0 -- 12
HADS depression (0--21) 3.6 ± 2.9 0 -- 12
  1. Numbers in parentheses indicate theoretical score ranges.
  2. FEV1 = forced expiratory volume in one second; RV = residual volume; TLC = total lung capacity; DLCO = carbon monoxide diffusing capacity; VA = alveolar volume R = resistance; X = reactance; LAA = low attenuation area; WA = wall area; SGRQ = St. George's Respiratory Questionnaire; MRC = Medical Research Council; HADS = Hospital Anxiety and Depression Scale