Impact of folic acid fortification of flour on neural tube defects: a systematic review – Corrigendum

The authors have corrected Table 2 to note that estimates from the study by Boulet et al. (ref 40) are between two post-fortification periods, not between pre- and post-fortification

Table 2.

Description of the studies assessing the impact of flour fortification with folic acid on the prevalence of NTD

First author, year of publication,			Spina bifida*			Anencephaly*			NTD*
reference	Country	Period	PreF	PostF	%	PreF	PostF	%	PreF	PostF	%	Source of data
Boulet, 2008(40)†	USA	1999–2000/2003–2004	3·51	3·39	3·4	2·47	1·98	19·8				Birth certificates and prenatal data of live births and stillbirths from twenty-one birth defects surveillance systems

†Estimates from the study by Boulet et al. are between two post-fortification periods, not between pre- and post-fortification.