Prevalence of Spina Bifida

The prevalence rate of spina bifida declined 31% from the prefortification (1995–1996) rate of 5.04 per 10,000 to the post-fortification (1998–2006) rate of 3.49 per 10,000.

1. 1995 (prefortification) 4.86 prevalence per 10,000.
2. 1996 (prefortification) 5.22 prevalence per 10,000.
3. 1997 (optional fortification) 4.35 prevalence per 10,000.
4. 1998 (optional fortification) 4.12 prevalence per 10,000.
5. 1999 (mandatory fortification) 3.83 prevalence per 10,000.
6. 2000 (mandatory fortification) 3.54 prevalence per 10,000.
7. 2001 (mandatory fortification) 3.6 prevalence per 10,000.
8. 2002 (mandatory fortification) 3.62 prevalence per 10,000.
9. 2003 (mandatory fortification) 3.34 prevalence per 10,000.
10. 2004 (mandatory fortification) 3.63 prevalence per 10,000.
11. 2005 (mandatory fortification) 3.27 prevalence per 10,000.
12. 2006 (mandatory fortification) 3.05 prevalence per 10,000.