External validation of prognostic models for preeclampsia in a Dutch multicenter prospective cohort.

Objective: To perform an external validation of all published prognostic models for first-trimester prediction of the risk of developing preeclampsia (PE).

Methods: Women <14 weeks of pregnancy were recruited in the Netherlands. All systematically identified prognostic models for PE that contained predictors commonly available were eligible for external validation.

External validation of prognostic models to predict risk of gestational diabetes mellitus in one Dutch cohort: prospective multicentre cohort study.

Objective:  To perform an external validation and direct comparison of published prognostic models for early prediction of the risk of gestational diabetes mellitus, including predictors applicable in the first trimester of pregnancy.

Design:  External validation of all published prognostic models in large scale, prospective, multicentre cohort study.

Setting:  31 independent midwifery practices and six hospitals in the Netherlands.