Maternal and Child Health Journal

, Volume 15, Issue 7, pp 851–859 | Cite as

Reliability and Validity of Birth Certificate Prepregnancy Weight and Height Among Women Enrolled in Prenatal WIC Program: Florida, 2005

  • Sohyun Park
  • William M. Sappenfield
  • Connie Bish
  • Diana M. Bensyl
  • David Goodman
  • Jane Menges
Article

Abstract

To investigate the reliability and validity of weight, height, and body mass index (BMI) from birth certificates with directly measured values from the Women, Infants, and Children (WIC) Program. Florida birth certificate data were linked and compared with first trimester WIC data for women with a live birth during the last quarter of calendar year 2005 (n = 23,314 women). Mean differences for weight, height, and BMI were calculated by subtracting birth certificate values from WIC values. Reliability was estimated by Pearson’s correlation. Validity was measured by sensitivity and specificity using WIC data as the reference. Overall mean differences plus or minus standard error (SE) were 1.93 ± 0.04 kg for weight, −1.03 ± 0.03 cm for height, and 1.07 ± 0.02 kg/m2 for BMI. Pearson’s correlation ranged from 0.83 to 0.95, which indicates a strong positive association. Compared with other categories, women in the second weight group (56.7–65.8 kg), the highest height group (≥167.6 cm), or BMI < 18.5 had the greatest mean differences for weight (2.2 ± 0.08 kg), height (−2.4 ± 0.05 cm), and BMI (1.5 ± 0.06), respectively. Mean differences by maternal characteristics were similar, but statistically significant, likely in part from the large sample size. The sensitivity for birth certificate data was 77.3% (±1.42) for underweight (BMI < 18.5) and 76.4% (±0.51) for obesity (BMI ≥ 30). Specificity was 96.8% (±0.12) for underweight and 97.5% (±0.12) for obesity. Birth certificate data had higher underweight prevalence (6 vs. 4%) and lower obesity prevalence (24 vs. 29%), compared with WIC data. Although birth certificate data overestimated underweight and underestimated obesity prevalence, the difference was minimal and has limited impact on the reliability and validity for population-based surveillance and research purposes related to recall or reporting bias.

Keywords

Reliability Validity Birth certificate Prepregnancy weight Prepregnancy height Prepregnancy BMI WIC 

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Copyright information

© Springer Science+Business Media, LLC 2009

Authors and Affiliations

  • Sohyun Park
    • 1
  • William M. Sappenfield
    • 2
  • Connie Bish
    • 3
  • Diana M. Bensyl
    • 4
  • David Goodman
    • 3
  • Jane Menges
    • 2
  1. 1.Division of Nutrition, Physical Activity and Obesity, National Center for Chronic Disease Prevention and Health Promotion (NCCDPHP)Centers for Disease Control and PreventionAtlantaUSA
  2. 2.Division of Family Health ServicesFlorida Department of HealthTallahasseeUSA
  3. 3.Division of Reproductive Health, NCCDPHPCenters for Disease Control and PreventionAtlantaUSA
  4. 4.Epidemic Intelligence Service (EIS) Field Assignments Branch, CDD/OWCD/ODCenters for Disease Control and PreventionAtlantaUSA

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