ALB and chronic kidney disease: During the exposure window, patients with CKD compared with controls without CKD had a similar mean number of measurements of albumin-corrected serum calcium (7.3 vs 7.0, P=0.61), serum phosphate (6.0 vs 5.9, P=0.94), and calcium-phosphate product (4.8 vs 6.3, P=0.72).