There was significant association between albumin level and all-cause mortality among patients with chronic renal failure (pooled OR = 0.83, 95% CI = 0.69 to 1.00, P = 0.047, Fig 2C), while there was no significant association between creatinine and PTH levels and all-cause mortality (creatinine: pooled OR = 0.94, 95% CI = 0.83 to 1.06, P = 0.304, Fig 2D; PTH: pooled OR = 0.999, 95% CI = 0.997 to 1.000, P = 0.077, Fig 2E). Here, PTH is linked to chronic kidney disease.