Clinical characteristics.
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Parity is defined as the number of times a woman has given birth. Medians are reported with the range in brackets. 1Cases are defined as <37 weeks gestation compared with the women delivering at term between 39–40 weeks (controls). 2P-values are calculated by Mann Whitney U- test for continuous variables and chi-square test or Fisher's exact test for dichotomous variables.
创建时间：
2010-02-03
