BMJ 1995;311:773-776 (23 September)

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Birth weight and blood pressure: cross sectional and longitudinal relations in childhood

Peter Whincup, senior lecturer in clinical epidemiology,a Derek Cook, senior lecturer in epidemiology,b Olia Papacosta, research statistician,a M Walker, research administrator a

a University Department of Public Health, Royal Free Hospital School of Medicine, London NW3 2PF, b Department of Public Health Sciences, St George's Hospital Medical School, London SW17 0RE

Correspondence to: Dr Whincup.

Abstract

Objective: To examine cross sectional and longitudinal relations between birth weight and blood pressure in childhood.
Design: Cross sectional study of primary school children aged 9-11 years, with analysis in relation to previous measurements at 5-7 years in a subgroup.
Setting: 20 primary schools in Guildford and Carlisle.
Subjects: 1511 children measured at 9-11 years (response rate 79%), including 549 who had been measured at 5-7 years.
Main outcome measures: Blood pressure at 9-11 years, change in blood pressure between 5-7 and 9-11 years, birth weight (based on maternal recall), and placental weight (based on birth records).
Results: At 9-11 years birth weight was inversely related both to systolic blood pressure (regression coefficient -2.80 mm Hg/kg; 95% confidence interval -3.84 to -1.76) and to diastolic blood pressure (regression coefficient -1.42 mm Hg/kg; -2.14 to -0.70) once current height and body mass index were taken into account. Placental weight was inversely related to blood pressure after adjustment for current height and body mass index but placental ratio (placental weight to birth weight) was unrelated to blood pressure. Between 5-7 and 9-11 years systolic blood pressure rose more rapidly in children of lower birth weight (regression coefficient -1.71 mm Hg/kg; -3.35 to -0.07). This effect seemed to be stronger in girls.
Conclusions: Birth weight rather than placental ratio is the early life factor most importantly related to blood pressure in childhood. The results support the possibility of "amplification" of the relation between birth weight and blood pressure, particularly in girls.

Key messages

  • Key messages

  • The placental ratio (placental weight to birth weight) is not related to blood pressure in children

  • The relation between birth weight and blood pressure becomes stronger (that is, "amplified") with increasing age in childhood

  • Whether amplification provides evidence of "programming" has still to be resolved


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