Characteristics of cases and controls from the full and hospitalised cohorts
| Full cohort | Hospitalised cohort | |||
|---|---|---|---|---|
| Cases | Controls* | Cases | Controls* | |
| *To account for case-control matching, all means and percentages for controls are weighted by the inverse of the number of controls in each case-control matched set. | ||||
| Number | 3894 | 35399 | 1886 | 13636 |
| Mean age (years) | 20.4 | 23.2 | 21.8 | 23.0 |
| Percentage male | 50.9 | 55.9 | 48.8 | 51.1 |
| Asthma hospital admissions during baseline (mean) | 0.39 | 0.31 | 0.78 | 0.68 |
| Frequency of matching asthma drugs during the year before the index date (mean) | ||||
| Oral corticosteroid prescriptions | 0.60 | 0.57 | 0.98 | 0.76 |
| Inhaled β agonist metered dose inhalers | 6.88 | 5.16 | 9.24 | 7.12 |
| Nebulised β agonist prescriptions | 0.50 | 0.45 | 0.77 | 0.56 |
| Oral β agonist prescriptions | 1.30 | 0.92 | 0.95 | 0.72 |
| Theophylline prescriptions | 1.92 | 1.87 | 2.13 | 1.94 |