Based on the HR being 1.46 for the group with vitamin D deficiency alone and 0.88 for the group with PTH excess only, the excess relative risk (ERR) associated with deficient 25(OH)D levels was calculated as 1.46 − 1 = 0.46 and the ERR related to PTH excess was −0.12, separately. Here, PTH is linked to vitamin D deficiency.