Patients divided into tertiles according to serum levels of PTH.

Values are given as mean (standard deviation) or median (25th–75th percentile). PTH, 1,25(OH)2D and ALP were log-transformed before used in the analyses. BMI, body mass index; PHPT, primary hyperparathyroidism; PTH, parathyroid hormone; iCa, ionised calcium; APL, alkaline phosphatase; 25(OH)D, 25-hydroxyvitamin D; 1,25(OH)2D, 1,25-dihydroxyvitamin D; eGFR, estimated glomerular filtration rate; BMD, bone mineral density. P-values for linear trend over tertiles.aValues are numbers (percentages), differences across tertiles are assessed with a chi-square test.dAge, BMI and gender were used as covariates.