Maternal size at birth and the development of hypertension during pregnancy: a test of the Barker hypothesis.
BACKGROUND
Whether individuals who were small at birth are at increased risk of developing cardiovascular disease (the Barker hypothesis) is a topic of great controversy. Although an increased risk has been suggested by several reports, the reports have been criticized for being based on ill-defined populations, for the large numbers of subjects who were unavailable for follow-up, and for inadequate control of socioeconomic status.


OBJECTIVE
To determine whether a woman's weight and gestational age at birth predict the development of hypertension during her subsequent pregnancies.


METHODS
Prospective observational study.


METHODS
Women born in Copenhagen, Denmark, as subjects in the Danish Perinatal Study (1959-1961) were traced through the Danish Population Register. Information was obtained on their pregnancies from 1974 to 1989.


METHODS
Onset of hypertension in pregnancy, defined by the presence of a systolic blood pressure of 140 mm Hg or greater or a diastolic blood pressure of 90 mm Hg or greater on 2 visits at or after 140 days' gestation.


RESULTS
Hypertension developed in 11.3% of the pregnant women who were small for gestational age at birth, compared with 7.2% of the pregnant women who were not small for gestational age at birth (odds ratio [OR], 1.7; 95% confidence interval [CI], 1.1-2.6), and in 9.4% of the pregnancies in women who were preterm at birth, compared with 7.6% of pregnancies in women who were not preterm at birth (OR, 1.3; 95% CI, 0.8-2.0). After adjustment for adult body mass index, smoking, birth order, and hypertension in the subjects' own mothers, the ORs for small-for-gestational-age women and preterm women to develop hypertension during pregnancy were 1.8 (95% CI, 1.1-2.8) and 1.5 (95% CI, 0.96-2.5), respectively.


CONCLUSIONS
These results support the Barker hypothesis, while addressing many of the methodological criticisms of previous investigations.
Division of Epidemiology, Statistics, and Prevention Research, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD 20892-7510, USA.
M A
MA
Klebanoff
N J
NJ
Secher
B R
BR
Mednick
C
C
Schulsinger
D000328:Adult; D001724:Birth Weight; D015992:Body Mass Index; D015986:Confounding Factors, Epidemiologic; D003718:Denmark; D005260:Female; D006801:Humans; D006973:Hypertension / Q000209:etiology* / Q000235:genetics; D007231:Infant, Newborn; D011247:Pregnancy; D011249:Pregnancy Complications, Cardiovascular / Q000209:etiology*; D012306:Risk; D012307:Risk Factors; D012959:Socioeconomic Factors