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  • Title: Comparison of the Bishop score, body mass index and transvaginal cervical length in predicting the success of labor induction.
    Author: Uyar Y, Erbay G, Demir BC, Baytur Y.
    Journal: Arch Gynecol Obstet; 2009 Sep; 280(3):357-62. PubMed ID: 19130065.
    Abstract:
    PURPOSE: To evaluate the role of ultrasonographic and various maternal and fetal parameters in predicting successful labor induction. METHODS: Body mass index, cervical length, dilatation, effacement, Bishop score, parity, maternal age and birth weight were evaluated in 189 singleton pregnant women at 37-42 weeks of gestation and having induction of labor. All underwent induction of labor with oxytocin. Body mass index was calculated using the formula weight (kg)/height(2) (m), cervical measurement was performed by transvaginal ultrasonography and Bishop score was determined by digital examination of cervix. RESULTS: Logistic regression analysis indicated that the cervical length and body mass index were independent variables in determining the risk of cesarean section (OR = 1.206, P = 0.000, CI 95% = 1.117-1.303; OR = 1.223, P = 0.007, CI 95% = 1.058-1.414 respectively). In multiple linear regression analysis, the effect of cervical length and body mass index on induction delivery interval was found to be statistically significant (t = 5.738, P = 0.000; t = 2.680, P = 0.009, respectively). ROC curve showed that the best parameter in predicting the risk of cesarean section was cervical length and that cervical length and body mass index were better parameters compared to the Bishop score (the areas under the curve are 0.819, 0.701 and 0.416, respectively). CONCLUSIONS: Body mass index and transvaginal cervical length were better predictors compared to the Bishop score in determining the success of labor induction.
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