Predicting Factors for Trial of Labor in Women Attempting Vaginal Birth after Cesarean Delivery

Cho, Moon Kyoung; Kim, Yoon Ha; Park, Sang Hyun; Kim, Seok Mo; Song, Tae Bok

Abstract

OBJECTIVE
To determine predicting factors associated with successful trials of labor in women attending vaginal birth after cesarean delivery.
METHODS
A retrospective chart review from January 1998 through December 2001 of 330 patients (sucess group n=282, failure group n=48) undergoing trials of labor after cesarean delivery at Chonnam National University Hospital. Data were tested for statistical significance with the Student's t-test and the Chi-square test.
RESULTS
The following characteristics were found to be statistically significant positive prognostic indicators: lower gestational age (274.0+/-20.6 vs. 281.1+/-7.9 days, p<0.01); higher gravity (1.3+/-0.5 vs. 1.0+/-0.2, p<0.01); higher maternal weight gain during pregnancy (3238+/-543 vs. 3458+/-497 gram, p<0.01); lower birth weight (7.8+/-2.7 vs. 6.6+/-2.5, p<0.01); history of prior trial of labor success (0.17 vs. 0.02, p<0.01), lower birth weight at prior cesarean section (3257+/-460 vs. 3838+/-411 gram, p<0.05).
CONCLUSIONS
The characteristics associated with successful trials of labor after cesarean delivery-Bishop score at admission, history of prior vaginal delivery will provide information that may be helpful to the physician and the patient. Trial of labor (probability)=e(13.48+0.14Bishop score+1.06vaginal delivery history-0.001birth weight-0.259gestational age)/1+e(13.48+0.14Bishop score+1.06vaginal delivery history-0.001birth weight-0.259gestational age)