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Abstract
Comparison between The efficacy of transvaginal ultrasonographic measurements of cervical length, posterior cervical angel and Bishop score before induction of labor in predicting the success of labor induction. This is a prospective study conducted in 100 women who underwent transvaginal ultrasonographic cervical length and posterior cervical angle measurements together and Bishop score before induction of labor. Induction of labor was successful in 56 of the women 18 were primi and 38 were multi. Regression analysis couldn{u2019}t be performed as all of angle, length & Bishop Score are highly correlated so they remove the effect of each other so the regression analysis will be useless. The cut-off point for the parameters in receiver operating characteristics curve were {u2264} 29mm for cervical length, 90{u00B0} for posterior cervical angle and {u2265}6for Bishop score. Cervical length of 29 mm had a sensitivity of 89.3% and a specificity of 61.4%, posterior cervical angle of 90{u00B0} with 100% and 86.4% respectively and for Bishop score {u2265}6 had a sensitivity of 96.4%, and a specificity of 93.2%. Both transvaginal sonographic measurements of cervical length, posterior cervical angle and Bishop score are useful and have the same dependency as predictors of successful labor induction