Lipoprotein(a) is not associated with coronary heart disease in the elderly: cross-sectional data from the Dubbo study

Lipoprotein(a) (Lp(a)) may be an independent risk factor for cardiovascular disease. We have examined Lp(a) concentration in 1202 males and 1512 females, aged 60 years and older, who were participants in an ongoing prospective study of cardiovascular disease in the elderly. This report relates to cross-sectional data at study entry. Median Lp(a) concentration was significantly higher in females than in males (P < 0.001), but did not vary with age. Lp(a) concentration rank was significantly correlated with total (r = 0.16, P < 0.001) and LDL cholesterol (r = 0.19, P < 0.001), but this relationship disappeared after adjustment of LDL cholesterol for Lp(a) cholesterol content. Twenty-four percent of males and 17% of females had prevalent coronary heart disease (CHD) at study entry based on non-invasive criteria. Median Lp(a) concentration was slightly higher in those subjects with CHD, compared with those without CHD, but the difference was not statistically significant (P > 0.20). In a multiple logistic model, the following variables were independent predictors of CHD in this elderly population: age, hypertension (males only), family history of CHD, HDL cholesterol and triglycerides (females only), but not total cholesterol or Lp(a). These relationships were similar whether or not the model included Lp(a) concentration. The findings do require confirmation in the prospective study now in progress.