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Table 3 SF-6D utility scores of smokers, ex-smokers, and subjects with or without respiratory symptoms

From: SF-6D utility scores of smokers and ex-smokers with or without respiratory symptoms attending primary care clinics

Characteristics N (%) SF-6D score (mean ± S.D.) Observed range / P-value*
Overall 731 0.850 ± 0.106 0.500–1
Pulmonary Symptoms
 Breathlessness < 0.001
  No symptom (0 point) 687 0.856 ± 0.100  
  Have breathlessness (≥1 point) 44 (6.0%) 0.752 ± 0.138  
 Cough 0.007
  No symptom (0 point) 481 0.858 ± 0.104  
  Have cough (≥1 point) 250 (34.2%) 0.836 ± 0.107  
 Sputum 0.004
  No symptom (0 point) 401 0.860 ± 0.097  
  Have sputum (≥1 point) 330 (45.1%) 0.838 ± 0.115  
 Total BCSS score < 0.001
  No symptom (0 point) 335 0.865 ± 0.094  
  Any of the above symptom (≥1 point) 396 (54.2%) 0.837 ± 0.113  
 Smoking status 0.892
  Current smoker 353 0.849 ± 0.107  
  Ex-smoker 378 0.851 ± 0.104  
 Smoking status for current smoker 0.700
  Light (< 10 cigarettes per day) 101 0.851 ± 0.106  
  Moderate (10–19 cigarettes per day) 147 0.844 ± 0.109  
  Heavy (≥20 cigarettes per day) 105 0.855 ± 0.107  
 Smoking status for ex-smoker 0.360
  Light (< 10 cigarettes per day) 52 0.867 ± 0.098  
  Moderate (10–19 cigarettes per day) 109 0.854 ± 0.099  
  Heavy (≥20 cigarettes per day) 212 0.845 ± 0.109  
  1. BCSS Breathlessness, Cough, and Sputum Scale
  2. *P-value of independent t-test / ANOVA test of SF-6D scores between patients with and without symptoms