Incidence and probability of disease occuring in Portsmouth
| Condition | Incidence/ birth prevalence | In Portsmouth (6000 deliveries/year) | Probability of seeing in any one year on 1 in 10 rota |
| Ondine's/Hirschsprung's /Neuroblastoma2 | 1in 1.4 million | 1 in 233 years | 0.00043 |
| Apert's (normal twin)3 | 1 in 80 000 | 1 in 13 years | 0.00769 |
| MCAD4 * | 1 in 22 000 | 1 in 3.6 years | 0.02732 |
| Galactosaemia5 | 1 in 450 000 | 1 in 7.5 years | 0.01333 |
| Prader-Willi6 | 1 in 16 000 | 1 in 2.6 years | 0.03846 |
| Pelizaeus-Merzbacher's (conatal form)7 | 1 in 770 000 | 1 in 128 years | 0.00078 |
| Munchausen syndrome by proxy (<1 year old)8 | 1 in 35 700 | 1 in 5.9 years | 0.01695 |
MCAD, medium chain acyl-CoA dehydrogenase deficiency.