Variation between practices in Royal College of General Practitioners Research and Surveillance Centre sentinel network in rates of respiratory infections among children with asthma
| Respiratory infection | Mean infection rate per 100 children with asthma (95% CI) | Variance | Median rate |
| LRTIs | |||
| Acute bronchitis and bronchiolitis | 6.1 (5.3 to 7.0) | 32.4 | 4.5 |
| Pneumonia and pneumonitis | 6.2 (5.3 to 7.1) | 32.2 | 4.5 |
| Pleurisy | 0.9 (0.6 to 1.2) | 3.1 | 0 |
| Other LRTIs | 0.5 (0.3 to 0.7) | 2.1 | 0 |
| Influenza-like Illness | 15.7 (14.1 to 17.3) | 107.5 | 14.8 |
| URTIs | |||
| Common cold | 21.1 (19.4 to 22.8) | 125.0 | 19.8 |
| Streptococcal sore throat | 0.1 (0.1 to 0.2) | 0.3 | 0 |
| Scarlatina | 0.5 (0.3 to 0.7) | 0.03 | 0 |
| Other URTIs | 24.5 (22.8 to 26.3) | 129.7 | 23.4 |
LRTIs, lower respiratory tract infections; URTIs, upper respiratory tract infections.