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: DESIGN, SETTING, AND PARTICIPANTS Cross-sectional study of 2310 healthy Icelandic adults who were divided equally into 3 age groups (30-45 years, 50-65 years, or 70-85 years) and recruited from February 2001 to January 2003.