Table 3.
Multivariate logistic regression of factors predicting all-cause readmission at 90 days.
| Variables | Odds ratio (95% CI) |
|||
|---|---|---|---|---|
| Unadjusted model | Model 1 | Model 2 | Final model | |
| Frailty | ||||
| Not frail | Reference | Reference | Reference | Reference |
| Mild | 1.20 (0.35–4.11) | 0.95 (0.24–3.72) | 0.65 (0.13–3.35) | 1.37 (0.32–5.85) |
| Moderate | 1.39 (0.40–4.82) | 0.70 (0.16–3.01) | 0.79 (0.15–4.10) | 0.28 (0.05–1.77) |
| Severe | 7.20 (2.16–24.02)* | 4.66 (1.22–17.76)* | 6.62 (1.26– 34.87)* | 5.19 (1.26–21.50)* |
| Sociodemographic | ||||
| Age (years) | – | 1.06 (0.99–1.12)$ | – | 1.09 (1.01–1.17)* |
| Activity domain | ||||
| Number of hospitalizations because of exacerbations in the previous year | – | 4.33 (1.77–10.60)* | – | 4.44 (1.67–1.84)* |
| Severity domain | ||||
| Length of hospital stay (days) | – | – | 1.08 (1.01–1.15)* | 1.07 (1.00–1.15)* |
| Comorbidities | – | – | 1.58 (1.00–2.50)$ | – |
| Impact domain | ||||
| Dyspnoea score, n (%) | – | – | ||
| MRC 0–2 | Reference | |||
| MRC 3 | 4.85 (1.20–19.60)* | |||
| MRC 4 | 0.84 (0.18–3.93) | |||
| R 2 | 15.7% | 36.4% | 36.8% | 45.5% |
Unadjusted model included only frailty.
Model 1 included frailty, age, smoking status and number of hospitalizations because of exacerbations in the previous year (only odds ratios of those retained variables are shown).
Model 2 included frailty, requiring non-invasive ventilation, length of stay, comorbidities, cardiovascular comorbidity and dyspnoea score (only odds ratios of those retained variables are shown).
Final Model included frailty, age, number of hospitalizations because of exacerbations in the previous year, length of stay, comorbidities and dyspnoea score (only odds ratios of those retained variables are shown).
MRC, Medical Research Council; CI, confidence interval.
p<0.05; $p<0.10.