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Joint associations of 25-hydroxyvitamin D and parathyroid hormone with risk of CHD. Multivariate model was adjusted for age at blood draw, smoking status, fasting status, time of blood draw, BMI, postmenopausal status and hormone use, physical activity, alcohol intake, aspirin use, MI family history, and AHEI score. Participants with a PTH level below the median and 25OHD level in the lowest quartile were set as the reference group.
