Table 5 Change in prevalence rates of NTDs due to FA supplementation by NTD type and sex in northern China, 1993–1995 (per 1000 births)
Change | Male | Female | Female–Male DID Value | P value |
|---|---|---|---|---|
rate | rate | Â | Â | |
Open NTDs | 2.6 | 7.5 | 4.9 | 0.000 |
Anencephaly | 1.6 | 4.8 | 3.2 | 0.000 |
Spina bifida | 1.1 | 2.7 | 1.6 | 0.083 |
Encephalocele | 0.2 | 0.1 | −0.1 | 0.587 |
Total NTDs | 2.8 | 7.6 | 4.8 | 0.000 |