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