Does plasma cholesterol concentration predict mortality from coronary heart disease in elderly people? 18 year follow up in Whitehall study.

OBJECTIVE

To explore the extent to which the relation between plasma cholesterol concentration and risk of death from coronary heart disease in men persists into old age.

DESIGN

18 year follow up of male Whitehall civil servants. Plasma cholesterol concentrations and other risk factors were determined at first examination in 1967-9 when they were aged 40-69. Death of men up to 31 January 1987 was recorded.

SUBJECTS

18,296 male civil servants, 4155 of whom died during follow up.

MAIN OUTCOME MEASURES

Cause and age of death. Cholesterol concentration in 1967-9 and number of years elapsed between testing and death.

RESULTS

1676 men died of coronary heart disease. The mean cholesterol concentration in these men was 0.32 mmol/l higher than that in all other men (95% confidence interval 0.26 to 0.37 mmol/l). This difference in cholesterol concentrations fell 0.15 mmol/l with every 10 years' increase in age at screening. The risk of raised cholesterol concentration fell with age at death. Compared with other men cholesterol concentration in those who died of coronary heart disease was 0.44 mmol/l higher in those who died aged less than 60 and 0.26 mmol/l higher in those aged 60-79 (p = 0.03). For a given age at death the longer the gap between cholesterol measurement and death the more predictive the cholesterol concentration, both for coronary heart disease and all cause mortality (trend test p = 0.06 and 0.03 respectively).

CONCLUSION

Reducing plasma cholesterol concentrations in middle age may influence the risk of death from coronary heart disease in old age.