Table 2

Assignment of independent variables

VariablesAssignment method
Cognitive frailtyNon-cognitive frailty=0; cognitive frailty=1
AgeOriginal value entry
BMIOriginal value entry
GenderFemale=0; male=1
Education levelPrimary school and below=0; junior high/high school=1; college and above=2
Occupation before retirementFarmer=0; worker=1; intellectual=2; others=3
Monthly income (¥)≤3000=0; 3000–5000=1; ≥5000=2
Mobility aidsNo=0; yes=1
Exercise (times/week)0=0; 1–2=1; ≥3=2
CKD stageCKD stages 1–3=0; CKD stages 4–5=1
DialysisNo=0; yes=1
Heart failureNo=0; yes=1
HyperuricaemiaNo=0; yes=1
SHPTNo=0; yes=1
BI scoreOriginal value entry
MNA-SF scoreMalnutrition=0; Eutrophy=1
PSQI scoreOriginal value entry
GDS-15 scoreOriginal value entry
SSRS scoreOriginal value entry
CRPOriginal value entry
ParathormoneOriginal value entry
FerritinOriginal value entry
AlbuminOriginal value entry
BUNOriginal value entry
CreatinineOriginal value entry
TCOriginal value entry
TriglyceridesOriginal value entry
White cellOriginal value entry
HaemoglobinOriginal value entry
GFROriginal value entry

  • BI, Barthel Index; BMI, body mass index; BUN, blood urea nitrogen; CKD, chronic kidney disease; CRP, C-reactive protein; GDS-15, 15-item Geriatric Depression Scale; GFR, glomerular filtration rate; MNA-SF, Mini-Nutritional Assessment-Short Form; PSQI, Pittsburgh Sleep Quality Index; SHPT, secondary hyperparathyroidism; SSRS, Social Support Rating Scale; TC, total cholesterol.