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Table 2 Prevalence of dry and productive cough at follow-up in subjects with and without identifiable respiratory disease according to respiratory conditions, demographic characteristics, and health status.

From: Associations of physical and mental health problems with chronic cough in a representative population cohort

   Dry cough Cough + sputum
All subjects (n = 3206)   12.1 4.6
Respiratory disease    
Asthma* (433)   25 6
Emphysema (43)   37 23
Chronic bronchitis (227)   22 12
Airways obstruction** (150)   30 11
≥ 12% FEV1 reversibility (129)   14 9
No respiratory disease (n = 2408)   8.8 3.8
Sex Male 10.3 4.9
  Female 7.3 2.6
Smoking status Current 20.9 7.3
  Former 6.6 2.4
  Never 5.5 3.3
Age (years) < 40 6.3 4.9
  40-54 10.5 3.6
  55 and over 10.4 1.9
Atopy Yes 9.2 4.3
  No 8.0 2.9
ACE inhibitor use Yes 14.4 2.7
  No 8.3 3.8
GHQ disturbance High 15.9 7.8
  Low/none 7.7 3.2
Self-rated health general health Fair/Poor 19.3 6.0
  Good/excellent 8.8 2.2
SF - 36 Mean (SE) PCS 44.5 (0.5) 44.7 (0.8)
  MCS 49.6 (0.6) 47.8 (1.0)
  1. * asthma: self reported current doctor diagnosed.
  2. Self reported doctor diagnosed emphysema and chronic bronchitis,
  3. ** Airways obstruction = post-bronchodilator FEV1/FVC < 0.07