Mid-2003 cystic fibrosis population by age and sex
| 0–<1 | 1–<5 | 5–<10 | 10–<15 | 15 | 16 | 17–<25 | 25–<35 | 35–<45 | 45–55 | >55 | Total | |
| Male | 140 | 550 | 700 | 725 | 152 | 143 | 992 | 672 | 318 | 40 | 7 | 4439 |
| Female | 140 | 550 | 700 | 634 | 128 | 140 | 802 | 479 | 221 | 39 | 12 | 3845 |
| Total | 280 | 1100 | 1400 | 1359 | 280 | 283 | 1794 | 1151 | 539 | 79 | 19 | 8284 |
| % | 3.4 | 13.3 | 16.9 | 16.4 | 3.4 | 3.4 | 21.7 | 13.9 | 6.5 | 1.0 | 0.2 | 100.0 |
The size of the 0–9-yrs-old-age group was estimated from population births and survival data. The size of the age groups of ≥10 yrs of age was based on data held by the UK Cystic Fibrosis Survey.