Risk factors for death from any cause after hospital admission for asthma (results of a multivariable model2-1, n = 156)
| Variables remaining in the model | Odds ratio2-1 | 95% CI |
|---|---|---|
| Onset preceded by upper respiratory tract infection | ||
| No URTI | 1.00 | |
| Not known | 1.82 | 0.71 to 4.65 |
| URTI | 0.302-150 | 0.10 to 0.89 |
| Highest peak flow (change per 50 l/min decrease) | 1.22 | 0.97 to 1.52 |
| Pco2 | ||
| Not done or ⩽6.1 | 1.00 | |
| >6.1 | 7.99** | 1.93 to 33.01 |
| Ipratropium or Duovent | ||
| Not prescribed | 1.00 | |
| Prescribed | 2.902-150 | 1.20 to 7.00 |
| Inhaled steroids | ||
| Prescribed | 1.00 | |
| Not prescribed | 3.032-150 | 1.15 to 8.33 |
↵2-150 p<0.05; **p<0.001.
↵2-1 The following variables were entered into the model: age, sex, labscore >3, chest tightness, length of stay, highest peak flow (as a continuous variable), clinically severe asthma, COPD co-morbidity, attack preceded by upper respiratory tract infection (URTI, not known, yes and no), nebuliser, ever smoked, chest pain, history of cardiovascular disorder, Pco2 not done or ⩽6.1 vs >6.1, ipratropium or Duovent, inhaled steroids.