text_1: High dietary calcium intakes are unnecessary for prevention of secondary hyperparathyroidism in subjects with 25(OH)D levels above 75 nmol/liter.
text_2: Participants were further divided into groups according to calcium intake (<800 mg/d, 800-1200 mg/d, and >1200 mg/d) and serum 25-hydroxyvitamin D level (<10 ng/mL, 10-18 ng/mL, and >18 ng/mL).