Table 3.

Comparison of frequencies of IMD and categories of disorders found by retrospective population-based studies.

Program	SAMSO-DHC	British Columbia 1	Italy 20	West Midlands 22	Oman 21
Study years	1983-2008	1969-1996	1985-1997	1999-2003	6/1998-12/2006
Population	165 530	1 142 912	7 173 959	310 510	51 000
No. of cases	248	173	1935	396	82
General	1:667	1:2500	1:3	703 (1:2 758)b	1:784	1:1555
Aminoacidopathies	1:4356	1:6606	1:36 389	1:5354	1:6375
Glycogen storage disease	1:9737a	1:69 054a	1:19 532	1:14 786	1:7285
Galactosemia	1:10 345	1:36 200	1:50 316c	1:16 343	1:25 500
Fatty acid oxidation disorder	1:41 382	NA	1:91 599	1:12 938	1:7285
Lyosomal storage diseases	1:2236	1:13 112	1:8 275	1:5 175	1:2318
Urea cycle disordersa	1:13 794	1:53 717	1:41 506	1:22 179	1:6375
Organic acidopathies	1:3448	1:27 082	1:21 422	1:7962	1:5666

^aTotal including Pompe disease;

^bIn last 5 years of study;

^cRegional Neonatal Screening.