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Birth weight and blood pressure: ‘J’ shape or linear shape? Findings from a cross-sectional study in Hong Kong Chinese women
  1. Yao Jie Xie1,
  2. Suzanne C Ho2,
  3. Zhao-Min Liu3,
  4. Stanley Sai-Chuen Hui1
  1. 1Department of Sports Science and Physical Education, The Chinese University of Hong Kong, Hong Kong, China
  2. 2Division of Epidemiology, The Jockey Club School of Public Health and Primary Care, The Chinese University of Hong Kong, Hong Kong, China
  3. 3Department of Medicine & Therapeutics, The Chinese University of Hong Kong, Hong Kong, China
  1. Correspondence to Professor Suzanne C Ho; suzanneho{at}cuhk.edu.hk

Abstract

Objectives To investigate the association between birth weight and blood pressure (BP) and to determine the effect of body size change from birth to adulthood on BP.

Design A cross-sectional design to collect retrospective data.

Participants 1253 female nurses aged 35–65 years in Hong Kong.

Main outcome measures Birth weight, height, weight, BP, waist circumference, demographics and lifestyle factors were collected by a self-administered questionnaire through mail survey. These self-reported variables have been validated in a pilot study. The conditional relative weight (CRW), which was calculated as a residual of current weight regressed on birth weight, was used to express higher or lower relative weight gain from birth to adulthood.

Results No significant linear association between overall range of birth weight and BP was found. The curve estimation showed a significant quadratic curvilinear association (‘J’ shape). In the piecewise-linear analysis, a significant inverse association between birth weight z-scores and BP was observed in the birth weight ≤3.1 kg group (systolic BP (SBP): coefficient B=−1.73, 95% CI −3.17 to −0.30; diastolic BP (DBP): B=−1.12, 95% CI −2.19 to −0.06). A positive but non-significant association occurred in the birth weight >3.1 kg group. Participants who belonged to the lowest 10% birth weight category but at the current top 10% BMI group had higher BP than participants in other BMI groups. The CRW z-score was positively associated with BP (coefficient B: 4.18 for SBP and 2.87 for DBP).

Conclusions Unlike most previous studies, we found a ‘J’ shape association rather than a linear association between birth weight and BP. Women with large percentile crossing of body size from birth to adulthood were more likely to have elevated BP. A higher weight gain from birth to adulthood than expected led to higher BP.

  • Birth weight
  • Blood pressure
  • Body mass index
  • Fetal programming
  • Chinese women

This is an Open Access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 3.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/3.0/

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