Table 6. Parameter estimates of the independent risk factors and risk score points.

Variables	Parameter estimates	Ratio	Risk score point
Age (years) ≥ 85	0.733	2.42	2
Sex (Male)	0.520	1.72	2
BMI (kg/m2) < 20	0.632	2.10	2
Cr (mg/dl) < 6.5	0.302	1.0	1
Albumin (g/dL) < 3.0	0.771	2.55	3
Ca (mg/dl) ≥ 8.5	0.331	1.10	1
CRP (mg/dl) ≥ 2.0	0.743	2.46	2
Absence of AVF no	0.963	3.19	3
Cancer yes	0.451	1.49	1
Dementia yes	0.798	2.64	3

Risk score = older age + male sex + low BMI + low Cr + low albumin + normal or high Ca + high CRP + absence of AVF-no + cancer-yes + dementia-yes.

Older Age, yes = 2, no = 0; sex, male = 2, female = 0; low BMI, yes = 2, no = 0; low Cr, yes = 1, no = 0; low albumin, yes = 3, no = 0; normal or high Ca, yes = 1, no = 0; high CRP, yes = 2, no = 0; absence of AVF; no = 3, yes = 0; cancer, yes = 1, no = 0; dementia, yes = 3, no = 0.