Description of the study population at the enrollment.
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RDS: respiratory distress syndrome. DRG: diagnosis related groups at discharge. PROM: premature rupture of membrane. Numbers are mean(sd). P value from t-test.*n(%), p value from chi-square test.§complications were classified according to ICD-9 codes.§§pregnancy data were classified according to ICD-9 diagnosis codes.**n(%), p value from Fisher exact test.Description of the study population at the enrollment.
创建时间：
2015-12-03
