Validating the Performance of the Modified Early Obstetric Warning System Multivariable Model to Predict Maternal Intensive Care Unit Admission.

Objectives: To evaluate the performance of the Modified Early Obstetric Warning System (MEOWS) to predict maternal ICU admission in an obstetric population.

Design: Case-control study.

Setting: Two maternity units in Vancouver, Canada, one with ICU facilities, between January 1, 2000, and December 31, 2011.