HRs were adjusted for age, gender, cause of CKD, smoking status, duration of hemodialysis, history of hyperparathyroidism treatment, baseline comorbidities (diabetes and cardiovascular disease), baseline creatinine, baseline total protein, time-varying medications (VDRA, phosphate binders, iron supplements) and time-varying laboratory tests (Kt/V, iPTH, Ca, P, albumin, ferritin, iron, and hemoglobin). The P-values for the interaction (Wald test with one degree of freedom) were 0.077 for all-cause hospitalizations, 0.642 for cardiovascular-related hospitalizations, 0.530 for infection-related hospitalizations, and 0.024 for VA-related hospitalizations. Abbreviations: iPTH, intact parathyroid hormone.