Abstract
Although lipoprotein(a) [Lp(a)] is associated with incident cardiovascular disease (CVD), its contribution to prediction remains controversial. This study examined the association and clinical utility of Lp(a) with incident CVD in women. A turbidimetric assay assessed Lp(a) in 3 cohorts of women (the WHS [Women's Health Study] [N = 24,558], a case-cohort sample from the WHI [Women's Health Initiative] Observational Study [n = 1,815 cases, subcohort n = 1,989], and the JUPITER [Justification for Use of Statins in Prevention] trial [n = 2,569]) and in men from JUPITER (n = 5,161). A WHS derivation sample (n = 16,400) determined the form of association with incident CVD. This was tested in WHS validation data (n = 8,158) and the other study samples. Models including traditional CV risk factors but with and without Lp(a) were compared using risk reclassification. In the WHS, there was a curvilinear association, with increased CVD risk among those with Lp(a) >50 mg/dl, but only among women with total cholesterol (TC) >220 mg/dl. In the WHS test sample, there was a small but significant change in the C-statistic (0.790 to 0.797; p = 0.035) but no improvement in measures of reclassification. This pattern was replicated among women in ...Continue Reading
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