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David A Leon a Department of Epidemiology and Population
Health, London School of Hygiene and Tropical Medicine,
London WC1E 7HT, b Institute of Geriatrics, University of Uppsala, S-751
25 Uppsala, Sweden, c Department of Sociology,
Stockholm University, S-106 91 Stockholm, Sweden
Correspondence to: Dr Leon dleon{at}lshtm.ac.uk
Objective: To establish whether fetal growth rate (as
distinct from size at birth) is associated with mortality from ischaemic heart disease.
Design: Cohort study based on uniquely detailed
obstetric records with 97% follow up over the entire life course and linkage to census data in adult life.
Subjects: All 14 611 babies delivered at the Uppsala
Academic Hospital, Sweden, during 1915-29 followed up to end of 1995.
Main outcome measures: Mortality from ischaemic heart
disease and other causes.
Results: Cardiovascular disease showed an inverse
association with birth weight for both men and women, although this was
significant only for men. In men a 1000 g increase in birth weight was
associated with a proportional reduction in the rate of ischaemic heart
disease of 0.77 (95% confidence interval 0.67 to 0.90). Adjustment for
socioeconomic circumstances at birth and in adult life led to slight
attenuation of this effect. Relative to the lowest fourth of birth
weight for gestational age, mortality from ischaemic heart disease in
men in the second, third, and fourth fourths was 0.81 (0.66 to 0.98),
0.63 (0.50 to 0.78), and 0.67 (0.54 to 0.82), respectively. The
inclusion of birth weight per se and birth weight for gestational age
in the same model strengthened the association with birth weight for
gestational age but removed the association with birth weight.
Conclusion: This study provides by far the most
persuasive evidence of a real association between size at birth and mortality from ischaemic heart disease in men, which cannot be explained by methodological artefact or socioeconomic confounding. It
strongly suggests that it is variation in fetal growth rate rather than
size at birth that is aetiologically important.
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