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(Hypertension. 2004;43:203.)
© 2004 American Heart Association, Inc.

Scientific Contributions

Effect of Birth Weight on Blood Pressure and Body Size in Early Adolescence

From the Department of Medicine, Thomas Jefferson University (B.F.), Philadelphia, Pa, Crozer-Keystone Health System (S.H.), Crozer, Pa and Biomedical Computer Research Institute (H.K.), Philadelphia, Pa.

Correspondence to Dr Bonita Falkner, 833 Chestnut Street, Suite 700, Philadelphia, PA 19107. E-mail Bonita.Falkner{at}jefferson.edu

The fetal programming theory that birth weight contributes to blood pressure or body size in later life is examined in this study. A prospective longitudinal study was conducted on subjects who were examined as newborns and prospectively interviewed and re-examined at 11 to 14 years old. Low birth weight (<2500 g) was present in 36% of the sample. The adolescent examination included measurements of blood pressure (BP), both auscultation and oscillometric methods; anthropometrics (height, weight, and body mass index [BMI]); health status; and health behaviors. Data were analyzed on 250 subjects. Correlation coefficients of birth weight with all BP measures were nonsignificant, except for the last auscultated diastolic BP (r=0.19, P<0.01), which had a positive relationship. The simple correlation coefficients of birth weight with adolescent body size were significant and positive for weight and BMI. After multiple linear regression analyses with adjustments for age, Tanner stage, and gestational age, there was no significant effect of birth weight on adolescent weight or BMI. No significant correlations were detected for ponderal index at birth with adolescent measures. This study, which includes a substantial portion of low-birth-weight cases (36%), indicates that birth weight does not correlate negatively with later BP. These results do not support the low-birth-weight theory and indicate that childhood factors that are more proximal have a greater effect on adolescent BP than intrauterine factors.

Key Words: blood pressure • adolescence

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