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Table 1 Demographic data of the COPD patients (n = 443)

From: Determinants of chronic obstructive pulmonary disease severity in the late-elderly differ from those in younger patients

  Age <75 years Age ≥75 years p value
No. of subjects 252 191  
Age (mean, years) 66.9 80.0  
Sex (male/female) 231/21 175/16 n.s.
Smoking amount (mean, pack-year) 56.9 55.6 n.s.
Current smoker (%) 17.3 7.7 0.004
BMI (mean, kg/m2) 22.5 22.3 n.s.
VC (mean, ml) 3365 2934 <0.001
VC (mean, % predicted) 93.8 93.5 n.s.
FEV1 (mean, ml) 1717 1465 <0.001
FEV1 (mean, % predicted) 60.5 62.1 n.s.
GOLD grade (I/II/III/IV) 52/114/67/19 41/88/48/14 n.s.
LTOT (%) 10.7 15.9 n.s.
CAT (mean) 12.5 12.7 n.s.
SGRQ symptom (mean) 36.5 37.9 n.s.
SGRQ activity (mean) 39.7 47.5 0.001
SGRQ impact (mean) 18.3 22.3 0.04
SGRQ total (mean) 27.4 32.2 0.02
Oral corticosteroids (%) 3.2 3.6 n.s.
Inhaled corticosteroids (%) 35.0 32.8 n.s.
Long-acting β2 agonists (%) 42.0 48.8 n.s.
Long-acting muscarinic antagonists (%) 64.0 58.3 n.s.
  1. BMI body mass index, VC vital capacity, FEV 1 forced expiratory volume in 1 s, GOLD Global Initiative for Obstructive Lung Disease, LTOT long-term oxygen therapy, CAT COPD assessment test, SGRQ St George’s Respiratory Questionnaire, n.s. not significant