Results of regression analysis of the deseasonalised age specific rates for asthma episodes (and for acute bronchitis at all ages)
| Age group (years) | Linear and quadratic coefficients | Estimate1-150 | SE | Peak month of fitted curve |
| Asthma | ||||
| 0–4 | Time | 1.717 | 0.2073 | August 1993 |
| Time2 | –0.0143 | 0.0015 | ||
| 5–14 | Time | 0.746 | 0.1214 | July 1993 |
| Time2 | 0.0063 | 0.0009 | ||
| 15–44 | Time | 0.377 | 0.0405 | July 1994 |
| Time2 | 0.0026 | 0.0003 | ||
| 45–64 | Time | 0.224 | 0.0344 | August 1993 |
| Time2 | 0.0019 | 0.0003 | ||
| 65+ | Time | 0.335 | 0.0388 | November 1993 |
| Time 2 | 0.0026 | 0.0003 | ||
| All ages | Time | 0.486 | 0.0493 | November 1993 |
| Time2 | 0.0038 | 0.0004 | ||
| Acute bronchitis | ||||
| All ages | Time | 1.586 | 0.2179 | May 1994 |
| Time2 | –0.0113 | 0.0016 | ||
↵1-150 All regression coefficients were highly significant (p<0.0001).