The Incidence and Risk Factors of Acute Kidney Disease after Total Knee Arthroplasty with Early Postoperative Volume Supplement

Table 2

Demographic data.

Continuous variable	Mean ± SD
Age (years)	70.52±6.89
BMI (kg/m^2)	28.29±4.64
Preop. Cr (mg/dL)	0.85±0.31
Preop. eGFR (mL/min/1.73m^2)	77.80±24.66
Preop. Hb (g/dL)	12.86±1.33
OP time (min)	87.57±15.63
Length of stay (days)	3.41±0.71
Estimated blood loss (mL)	883.94±327.46
Nominal variable	Number of patients ( = 458)	Percentage (%)
Gender (M/F)
Male	81	82.3
Female	377	17.7
ASA
1	7	1.5
2	279	60.9
3	171	37.3
4	1	0.2
Anesthesia
Spinal	106	23.1
General	352	76.9
CKD	103	22.5
Diabetes	135	29.5
Hypertension	328	71.6
CAD	43	9.4
Transfusion rate	39	8.5
AKD	15	3.3

Preop.: preoperative.
Cr: creatinine.
eGFR: estimated glomerular filtration rate.
Hb: hemoglobin.
OP time: operative time.
CKD: chronic kidney disease; AKD: acute kidney disease.
CAD: coronary artery disease.