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Table 2 Comparison of people individuals with diagnosed and undiagnosed obstructive lung disease among thoseparticipants with airflow limitation

From: Underdiagnosis of obstructive lung disease: findings from the French CONSTANCES cohort

  Previous OLD diagnosisa P
Asthma (N = 224) COPD (N = 46) No (N = 493)
Sociodemographic     
 Males, % 48.8 77.1 54.5 0.04
 Age (years), m 41.8 58.5 43.8  < 0.001
 ISCED education level, %     
  0–2 (≤ lower secondary) 9.3 37.6 13.4 0.004
  3–4 (upper secondary) 36.3 42.1 40.4  
   ≥ 5 (tertiary) 54.4 20.2 46.2  
Tobacco consumption, %     
 Never 43.5 17.5 30.8  < 0.001
 Ever < 10 pack-years 37.9 4.7 28.5  
 Ever ≥ 10 pack-years 18.6 77.8 40.7  
BMI (kg/m2), m 24.6 27.4 24.8 0.38
Respiratory symptoms, %     
 Past-year wheezing 64.4 73.8 26.3  < 0.001
 Chronic cough 14.8 33.4 16.1 0.10
 Chronic sputum 11.8 22.9 11.5 0.29
 Dyspnoea grade ≥ 2 20.9 51.8 15.6  < 0.001
  ≥ 1 symptom 72.6 79.7 39.7  < 0.001
Cardiovascular comorbidities, %     
 No 86.7 61.7 87.1 0.003
 IHD, stroke, PAD 1.9 6.7 3.7  
 Other 11.4 31.8 9.2  
Lung function     
 FEV1 (L), m 2.56 1.80 2.75  < 0.001
 FEV1% predicted, m 72.8 58.0 78.5  
 GOLD severity, %      < 0.001
  Mild 28.3 3.3 48.4  
  Moderate 64.9 56.3 48.4  
  Severe 6.8 40.4 3.3  < 0.001
  1. BMI body mass index; COPD chronic obstructive pulmonary disease; FEV1 forced expiratory volume in 1 s; GOLD Global Initiative on Obstructive Lung Disease; IHD ischemic heart disease; ISCED International Standard Classification of Education; OLD obstructive lung disease; PAD peripheral arterial disease
  2. aPrevious OLD diagnosis reported by the participants; Asthma: diagnosis of asthma only; COPD: diagnosis of COPD, emphysema, or chronic bronchitis associated with a diagnosis of asthma in eight patients; No: no diagnosis of OLD (asthma, COPD, emphysema, chronic bronchitis, or bronchiectasis)
  3. Data are presented as weighted percentage (%) or weighted mean (m)
  4. Missing values in 95 participants (10 for education level, 90 for tobacco status, 5 for BMI, 2 for respiratory symptoms)