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Height loss and future coronary heart disease in London: the Whitehall II study
G David Batty1, Martin J Shipley, David Gunnell
1Department of Epidemiology & Public Health, University College London, 1-19 Torrington Place, London, UK. david.batty@ucl.ac.uk
Insights
Height loss may increase coronary heart disease (CHD) risk in men, suggesting shrinkage could explain the link between shorter stature and higher CHD risk. Further research is needed to confirm findings in women.
Area of Science:
- Cardiovascular epidemiology
- Human physiology
Background:
- Prospective studies link greater physical stature to lower coronary heart disease (CHD) risk.
- The role of reverse causality, specifically height loss (shrinkage), in this association remains unclear.
- Previous studies lacked repeat height measurements to investigate shrinkage.
Purpose of the Study:
- To investigate the relationship between height loss and future risk of coronary heart disease (CHD).
Main Methods:
- Analysis of data from the Whitehall II prospective cohort study.
- Involved 3802 men and 1615 women with height re-measured between 1997-9.
- Follow-up for fatal and non-fatal CHD events after the second height measurement.
Main Results:
- Greater height loss was associated with increased CHD risk in men (HR: 1.24; 95% CI: 1.00-1.53) after adjusting for baseline risk factors.
- No significant association was observed between height loss and CHD risk in women (HR: 0.93; 95% CI: 0.58-1.50).
- A mean follow-up of 7.4 years yielded 69 CHD events in men and 18 in women.
Conclusions:
- Height loss due to shrinkage may contribute to the observed inverse association between a single height measurement and later CHD risk.
- This finding highlights the importance of considering height changes in understanding CHD etiology.
- Further investigation is warranted to elucidate the mechanisms and confirm findings in diverse populations.
Background:
Although several plausible biological mechanisms have been advanced for the association between greater physical stature and lower coronary heart disease (CHD) risk in prospective cohort studies, the importance of one of the principal artefactual explanations--reverse causality due to shrinkage--remains unresolved. To explore this issue, studies with repeat measurements of height are required, but, to date, such data have been lacking.
Objective:
To examine the possible relationship between height loss and future CHD.
Methods:
Data were analysed from the Whitehall II prospective cohort study of 3802 men and 1615 women who participated in a physical examination in 1985-8, had their height re-measured in 1997-9, and were then followed up for fatal and non-fatal CHD.
Results:
A mean follow-up of 7.4 years after the second height measurement gave rise to 69 CHD events in men and 18 in women. After adjustment for baseline CHD risk factors, greater loss of physical stature between survey and resurvey was associated with an increased risk of CHD in men (HR; 95% CI for a one SD increase: 1.24; 1.00 to 1.53) but not women (0.93; 0.58 to 1.50).
Conclusions:
Reverse causality due to shrinkage may contribute to the inverse association between a single measurement of height and later CHD in other studies.
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