Prevalence rates of 6 categories of congenital anomalies in Canada.

Anomaly	Time framea	Rate per 10 000 total birthsb
Down syndrome	1998–2007	14.1
Neural tube defects	2004–2007	4.0
Congenital heart defects	2009	85.1
Orofacial clefts	1998–2007	16.3
Limb deficiency defectsc	2007	3.5
Gastroschisis	2002–2009	3.7

^aTime frames vary depending on the data source used for ascertainment of information.

^bTotal births include live births and stillbirths.

^cFor limb deficiency defects, total births include pregnancy terminations over 20 weeks occurring in hospitals.