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Proportions and 95% CI of unplanned cesarean for predicted VBAC success scores by obstetrician or midwife provider type, Denver, Colorado, United States, 2005–2012. Subjects were divided by provider type and then into quintiles by predicted Grobman VBAC success score. The 95% confidence interval for proportion of unplanned cesarean within each quintile is graphed versus the predicted VBAC success. Line of agreement shows perfect match between predicted and actual cesarean rates.
