Table 6.
Spontaneous abortion rate for Arkansas and study population
| 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 |
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.