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Table 6 Spontaneous abortion rate for Arkansas and study population

From: A reproductive history of mothers with spina bifida offspring-a new look at old issues

 

Live Births

Spontaneous Abortions

Rate per 1000 Live Births

p value (1)

State of Arkansas (2)

36,356

930

25.58

----

All mothers (3)

    

   Pregnancy 1

240

31

129.16

< 0.0001

   Pregnancy 2

218

19

87.15

< 0.0001

   Pregnancy 3

124

23

185.48

< 0.0001

   Pregnancy 4

71

11

154.90

< 0.0001

  1. Notes: (1)X-square p values calculated using data for each pregnancy and state of Arkansas data. (2) Data are for year 1996; spontaneous abortions defined as < 20 weeks. (3) For comparison purposes, study population rates calculated as if all pregnancy outcomes for a particular pregnancy order occurred in one year. Cell frequencies for pregnancy 5 and greater were too small for analysis.