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Table 2 Demographic, clinical data, and data of the St George's Respiratory Questionnaire of participating COPD patients

From: Health status in COPD cannot be measured by the St George's Respiratory Questionnaire alone: an evaluation of the underlying concepts of this questionnaire

Variable Mean ± SD
Male sex % 76.7
Age (years) 65.8 ± 9.0
Education %  
   Low 48.6
   Middle 29.5
   High 19.9
Personal situation %  
   Partner 77.8
   Divorced 6.3
   Widowhood 8.3
   Single 7.6
Cigarette smoking %  
   Current 41.8
   Former 45.9
   Never 11.0
BMI (kg/m2) 25.9 ± 4.1
FEV1 (L) 1.6 ± 0.5
FEV1 % predicted 53.6 ± 13.9
FEV1/FVC % 44.0 ± 11.4
TLC % predicted 103.7 ± 14.6
RV % predicted 128.3 ± 30.3
TLCO % predicted 62.3 ± 21.5
GOLD %  
   I 2.1
   II 58.9
   III 34.2
   IV 4.8
SGRQ section  
   Symptoms 40.9 ± 24.8
   Activity 40.9 ± 21.8
   Impacts 20.2 ± 13.5
   Total 30.2 ± 15.4
  1. Data are presented as mean ± SD unless otherwise indicated. Percentages may not add up to 100 due to missing data (three patients with no specified education, two patients with no specified smoking habits). BMI: body mass index; FEV1 % predicted: forced expiratory volume in one second as percentage predicted; FEV1/FVC %: forced expiratory volume/forced vital capacity; TLC: total lung capacity; TLC % predicted: total lung capacity as percentage predicted; RV: residual volume; RV: residual volume as percentage predicted; TLCO % predicted: transfer capacity (of lung) for carbon monoxide as percentage predicted; GOLD: Global Initiative for Chronic Obstructive Lung Disease; SGRQ: St George's Respiratory Questionnaire.