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Table 1 Application of the Harris and Boyd partition criteria for pregnancy age

From: Comprehensive reference intervals for white blood cell counts during pregnancy

Pregnancy age

Reference interval (×10^9/L)

z score

0 week

3.7–9.3

 

4 weeks

4.7–11.9

8.27*

7 weeks

5.7–14.4

6.20*

40 weeks

6.0–15.0

1.41

  1. Z score was calculated by the formular [(‾x2 -‾x1)/(s12/n1 + s22/n2)]1/2, x2 and x1 are the adjacent points in 0, 4, 7, 40 weeks of gestation. When z score > = 5[(n1 + n2)/240]1/2, a reference interval partitioning was required. *Reference interval partitioning was necessary according to the z score from the Harris and Boyd’s test
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BMC Pregnancy and Childbirth

ISSN: 1471-2393

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