Continuous variables such as maternal age and GA are expressed as mean ± standard deviation. The incidence of RATs and pregnancy outcome results are expressed as number and percentage. Differences in outcomes between the RATs group and the low‐risk NIPS group were compared using the χ 2 test or Fisher's exact test. A p value of <0.05 was considered statistically significant. Statistical analysis was performed using SPSS 19.0 (IBM Corp).
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