Validity of Birth Certificate-Derived Maternal Weight Data

Background Studies using vital records‐based maternal weight data have become more common, but the validity of these data is uncertain. Methods We evaluated the accuracy of prepregnancy body mass index (BMI) and gestational weight gain (GWG) reported on birth certificates using medical record data i...

Full description

Saved in:
Bibliographic Details
Published in:Paediatric and perinatal epidemiology 2014-05, Vol.28 (3), p.203-212
Main Authors: Bodnar, Lisa M., Abrams, Barbara, Bertolet, Marnie, Gernand, Alison D., Parisi, Sara M., Himes, Katherine P., Lash, Timothy L.
Format: Article
Language:English
Subjects:
Adult
birth certificate
Birth Certificates
Body Mass Index
Cohort Studies
Ethnicity
Female
Humans
Infant, Newborn
Maternal Welfare
Medical records
Mothers
Pennsylvania
Population Surveillance
Pregnancy
Reproducibility of Results
validity
Weight
Weight Gain
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Background Studies using vital records‐based maternal weight data have become more common, but the validity of these data is uncertain. Methods We evaluated the accuracy of prepregnancy body mass index (BMI) and gestational weight gain (GWG) reported on birth certificates using medical record data in 1204 births at a teaching hospital in Pennsylvania from 2003 to 2010. Deliveries at this hospital were representative of births statewide with respect to BMI, GWG, race/ethnicity, and preterm birth. Forty‐eight strata were created by simultaneous stratification on prepregnancy BMI (underweight, normal weight/overweight, obese class 1, obese classes 2 and 3), GWG (80th percentile), race/ethnicity (non‐Hispanic white, non‐Hispanic black), and gestational age (term, preterm). Results The agreement of birth certificate‐derived prepregnancy BMI category with medical record BMI category was highest in the normal weight/overweight and obese class 2 and 3 groups. Agreement varied from 52% to 100% across racial/ethnic and gestational age strata. GWG category from the birth registry agreed with medical records for 41–83% of deliveries, and agreement tended to be the poorest for very low and very high GWG. The misclassification of GWG was driven by errors in reported prepregnancy weight rather than maternal weight at delivery, and its magnitude depended on prepregnancy BMI category and gestational age at delivery. Conclusions Maternal weight data, particularly at the extremes, are poorly reported on birth certificates. Investigators should devote resources to well‐designed validation studies, the results of which can be used to adjust for measurement errors by bias analysis.
ISSN:0269-5022
1365-3016
DOI:10.1111/ppe.12120