TABLE 2-4 National Data Sources for Maternal Weight and Their Methods of Acquiring Key Variables

Data Source

Prepregnancy Weight

Prepregnancy Height

Gestational Weight Gain

Postpartum Weight

Data Coverage

Ideal

Recalled weight at first prenatal visit is abstracted from clinical records

Measured height at first prenatal visit is abstracted from clinical records

Last recorded weight is abstracted from clinical records

Measured weight at least once starting 3 months or more postpartum

50 states, little to no missing data

Standard U.S. birth certificate

Not available

Not available

Recalled at delivery

Not applicable

49 states (excludes California)

Revised 2003 U.S. birth certificate

Recalled at delivery

Recalled at delivery

Based on last recorded weight abstracted from the medical record

Not applicable

19 states in 2006

PRAMS

Recalled at 2-4 months postpartum

Recalled at 2-4 months postpartum

Obtained from birth certificates (recalled at delivery)

Not available

8 states

PNSS

Recalled at the prenatal visit or postpartum visit

Measured at the prenatal visit or postpartum visit

Recalled at the postpartum visit

Measured at WIC postpartum recertification visit

Low-income women in 26 states

IFPS II

Recalled in the postpartum period

Recalled in the postpartum period

Recalled in the postpartum period

Recalled at 3, 6, 9, and 12 months

Nationally distributed consumer opinion panel

NOTE: IFPS II = Infant Feeding Practices Study II; PNSS = Pregnancy Nutrition Surveillance System; WIC = Special Supplemental Nutrition Program for Women, Infants, and Children.



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