Folate intake and the primary prevention of non-neural birth defects.

OBJECTIVES

To investigate whether maternal periconceptional folate intake is associated with a reduction in selected non-neural birth defects in Western Australia (WA).

METHODS

Case-control study of folate intake in women whose infants had orofacial clefts (62); congenital heart defects (151); urinary tract defects (117); limb reduction defects (26); or other major birth defects (119); and 578 control women.

RESULTS

Neither folic acid supplements nor dietary folate intake in women not using supplements was significantly associated with a reduction in risk in any of the case groups. In contrast to neural tube defects, WA population data for orofacial clefts, heart defects, limb reduction defects and urinary tract defects showed no fall in prevalence since the introduction of folate promotion and voluntary food fortification.

CONCLUSIONS

This study provides no evidence of folate being an important factor in the prevention of birth defects other than neural tube defects.