Increase the proportion of women who had a healthy weight before pregnancy — MICH‑13 Data Methodology and Measurement

About the National Data


Baseline: 42.1 percent of females delivering a live birth in 2018 had a healthy weight prior to pregnancy

Target: 47.1 percent

Number of females with a recent live birth who reported having a healthy weight (18.5 ≤ BMI < 25) prior to pregnancy.
Number of females with a recent live birth.
Target-setting method
Percentage point improvement
Target-setting method details
Percentage point improvement from the baseline using Cohen's h effect size of 0.10.
Target-setting method justification
Trend data were not available at the time of establishing the baseline and target for this objective. A percentage point improvement was calculated using Cohen's h effect size of 0.1. This method was used because, using data from another data source, it was observed that the trend was moving away from the desired direction and few effective interventions exist.


Methodology notes

The most current Institute of Medicine (IOM) recommendations were used to determine BMI categories based on maternal prepregnancy height and weight: Prepregnancy BMI* (kg/m2)

Underweight <18.5

Normal weight 18.5-24.9

Overweight 25.0-29.9

Obese =30.0*

*To calculate BMI go to the NIH website for assistance.


Comparable HP2020 objective
Modified, which includes core objectives that are continuing from Healthy People 2020 but underwent a change in measurement.
Changes between HP2020 and HP2030
This objective differs from Healthy People 2020 objective MICH-16.5 in that the data sources for objective MICH-16.5 were the Pregnancy Risk Assessment Monitoring System (PRAMS) and California's Maternal and Infant Health Assessment (MIHA), while the data source for this objective is the National Vital Statistics System-Natality (NVSS-N).

1. Effect size h=0.1 was chosen to correspond with 10% improvement from a baseline of 50%.