Determinants for re-admissions analysed by Cox regression
| All subjects | SGRQ total ≤60 | SGRQ total >60 | |
| Subjects n | 340 | 170 | 170 |
| Age 10 yrs | 1.16 (1.00–1.35) | 1.14 (0.92–1.419) | 1.19 (0.95–1.50) |
| Current smoker | 0.78 (0.55–1.10) | 0.69 (0.37–1.29) | 0.82 (0.53–1.26) |
| HAD-total 4 units* | 1.03 (0.93–1.13) | 0.87 (0.74–1.03) | 1.13 (1.01–1.27) |
| HAD-anxiety 4 units* | 1.10 (0.95–1.28) | 0.81 (0.63–1.04) | 1.36 (1.12–1.65) |
| HAD-depression 4 units* | 0.96 (0.80–1.15) | 0.83 (0.61–1.14) | 1.02 (0.81–1.28) |
| Anxiety* | 1.06 (0.79–1.41) | 0.43 (0.25–0.74) | 1.73 (1.18–2.53) |
| Depression* | 1.09 (0.80–1.51) | 0.84 (0.46–1.55) | 1.20 (0.81–1.79) |
| FEV1 10% pred | 0.83 (0.76–0.91) | 0.80 (0.70–0.92) | 0.83 (0.53–1.26) |
| SGRQ-total 4 units | 1.06 (1.02–1.11) | 1.06 (0.97–1.15) | 1.08 (0.98–1.18) |
Data presented as n and hazard ratio (95% confidence interval). SGRQ: St George's Respiratory Questionnaire; HAD: hospital anxiety and depression scale; FEV1: forced expiratory volume in one second. *: Entered separately into the model.