Breakdown of reported cases
| United Kingdom | Republic of Ireland | Total | |
|---|---|---|---|
| *January to December 1998. | |||
| †April 1998 to March 1999. | |||
| Cases reported | 390 | 40 | 430 |
| Completed questionnaires | 358 | 33 | 391 |
| Ineligible cases | 59 | 9 | 68 |
| Confirmed cases | 299 | 24 | 323 |
| Number of live births | 723084* | 53524† | 776618 |
| Incidence (per 1000 live births) | 0.41 | 0.45 | 0.42 |