Table 4– Associations between Short Form (SF)-12 physical component score (PCS) and mental health component score (MCS) in subjects with chronic obstructive pulmonary disease (COPD).
| PCS SF-12 | MCS SF-12 | |
| FEV1 per 10% predicted | 0.89 (0.68–1.1) | -0.07 (-0.29–0.16) |
| Dyspnoea | ||
| Grade 0 | Reference | Reference |
| Grade 1 | -1.9 (-3.0– -0.79) | -0.59 (-1.8–0.64) |
| Grade 2 | -4.1 (-5.4– -2.8) | -1.3 (-2.8–0.15) |
| Grade 3 | -5.5 (-7.2– -3.9) | -3.2 (-5.1– -1.4) |
| Grade 4 | -8.6 (-11– -6.6) | -6.2 (-8.4– -4.0) |
| Age per 10 years | -1.3 (-1.7– -0.96) | 0.75 (0.34–1.2) |
| Females compared with males | -1.4 (-2.2– -0.57) | -2.2 (-3.1–-1.3) |
| Symptoms | ||
| Chronic cough | -1.4 (-2.8– -0.07) | -0.48 (-2.0–1.0) |
| Chronic phlegm | -1.9 (-3.3– -0.53) | -1.4 (-3.0–0.17) |
| Wheeze | -1.1 (-2.0– -0.25) | -1.5 (-2.5– -0.46) |
| Body mass index kg·m−2 | ||
| <20 | 0.09 (-1.3–1.5) | -2.5 (-4.1– -1.0) |
| 20–25 | Reference | Reference |
| >25–30 | 0.06 (-1.0–0.88) | 0.78 (-0.43–1.6) |
| >30 | -1.4 (-2.5– -0.19) | 0.64 (-0.68–2.0) |
| Comorbidities | ||
| Heart disease | -1.5 (-2.6– -0.46) | -0.12 (-1.3–1.1) |
| Hypertension | -0.23 (-1.1–0.46) | -0.51 (-1.5–0.46) |
| Diabetes | -2.0 (-3.6– -0.53) | -0.69 (-2.4–1.0) |
| Stroke | -3.0 (-5.1– -1.0) | 0.82 (-1.4–3.1) |
Data are presented as adjusted estimates (95% confidence interval). Estimates are adjusted for the variables in the table, smoking history, educational level and centre. FEV1: forced expiratory volume in 1 s.