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Thai) 1:
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Pearson’s
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and Student t tests were used for univar iate 2-group comparisons. Logistic regression was applied to examine the significance for preterm birth adjusted for age, race, and placental abruption. The Hosmer-Lemeshow statistic examined the goodness-offit for the logistic regression models.
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Statistical compu tations were performed using SAS 8.2 (SAS Institute, Cary, NC). A 2-tailed P .05 was judged statistically significant.
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