Table 2. Biomarkers for which meta-analyses were performed.

Biomarker	No. of studies	References	Total population
Albumin	10	9–16, 19, 20	1125
Calcium	5	9, 13, 15, 19, 20	424
Creatinine	3	10, 14, 19	531
CRP	9	9–12, 14, 15, 18–20	1109
Ferritin	5	9–11, 18, 20	468
Haemoglobin	6	9–11, 13, 16, 20	484
HDL-C	7	9–11, 14, 16, 19, 20	912
LDL-C	7	9–11, 14, 16, 19, 20	912
PTH	4	9, 11, 18, 20	423
Phosphorus	5	9, 13, 15, 19, 20	424
Total cholesterol	4	11, 12, 14, 16	656
Triglycerides	7	9–11, 14, 16, 19, 20	912

CRP: C-reactive peptide; HDL-C: High density lipoprotein cholesterol; LDL-C: Low density lipoprotein cholesterol; PTH: Parathyroid hormone.