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Table 2 Kruskal-Wallis test results of the average NTDs rates of the buffer regions before and after folic acid supplementation

From: Identifying environmental risk factors for human neural tube defects before and after folic acid supplementation

period

Chi-Square

Degrees of Freedom

P

1998-2001

4.497

5

0.480

2002-2005

14.224

5

0.014

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BMC Public Health

ISSN: 1471-2458

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