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Table 1 The detecting results of different spatial filter sizes

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

filter sizes

the number of clusters

the number of grids included in clusters

1.6 km

3

3

2.4 km

2

4

3.2 km

2

4

4 km

2

9

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BMC Public Health

ISSN: 1471-2458

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