PTH and Marchiafava-Bignami disease: As PTH target ranges were determined at different levels in CKD3 (<70 pg/ml), CKD4 (<85 pg/ml) and CKD5 (non-dialysis - <110 pg/ml) in Russian National CKD-MBD guidelines, we evaluated the percentage of patients with PTH above these levels: 23/96 in treatment group and 26/96 in control group (p = 0.6); the mean baseline PTH levels were 69 ± 32 v.