Table 1. The number of cases and prevalence of all, and rare, chromosome abnormalities and the percent of these prenatally detected for each EUROCAT register included in this study.

Country	EUROCAT register(s)	Number of births in the EUROCAT registry areas 2000–2006	Number of all chromosome abnormalities reported to EUROCAT 2000–2006	% of all chromosome abnormalities prenatally detected	Prevalence of all chromosome abnormalities per 10 000 births	Number of rare chromosome abnormalities reported to EUROCAT 2000–2006	Prevalence of rare chromosome abnormalities per 10 000 births
Austria	Styriaa	62 667	228	76.4%	36.4	35	5.6
Belgium	Antwerpb	127 871	327	60.1%	25.6	47	3.7
Denmark	Odensec	37 346	137	70.9%	36.7	22	5.9
England and Wales	East Midlandsb	432 568	1564	68.6%	36.2	234	5.4
	Northern England	214 037	1030	58.8%	48.1	277	12.9
	Thames Valley	88 814	458	73.9%	51.6	66	7.4
	Wales	222 991	946	66.6%	42.4	184	8.3
	Wessex	185 616	983	63.7%	53.0	231	12.4
France	Paris	247 661	1860	92.3%	75.1	226	9.1
	Strasbourgb,d	64 276	285	81.8%	45.4	37	5.8
Germany	Saxony-Anhaltb	123 241	366	54.6%	29.7	57	4.6
Ireland	South East Irelandb	45 135	118	4.9%	26.1	11	2.4
Italy	Emilia Romagna	218 178	797	80.9%	36.5	118	5.4
Netherlands	N Netherlands	137 278	411	48.5%	29.9	73	5.3
Spain	Barcelona	96 912	491	88.1%	50.7	61	6.3
Switzerland	Vaud	50 275	322	83.8%	64.0	58	11.5
Total		2 354 668	10 323	65.2%	43.8	1737	7.4

^aData from 2000–2005 only.

^bNo routine downloads from cytogenetic labs.

^cOnly prenatal cytogenetic downloads.

^dData from 2000–2004 only.