Synthetic colloids as priming fluids in cardiopulmonary bypass and postoperative acute kidney injury: a propensity score-matched study

Table 1 Variables used for propensity score matching

Order	Variables	Level of measurement
1	Sex	Binary
2	Age, years	Continuous
3	BMI, kg/m²	Continuous
4	BSA, m²	Continuous
5	EF, %	Continuous
6	EuroSCORE	Ordinal
7	Smoking	Binary
8	Diabetes mellitus	Binary
9	Hypertension	Binary
10	Hyperlipidemia	Binary
11	Cerebrovascular accidents	Binary
12	History of cardiac surgery	Binary
13	Preoperative hemoglobin, g/L	Continuous
14	Preoperative HCT, %	Continuous
15	Preoperative platelet counts, × 10⁹/L	Continuous
16	Preoperative albumin, g/L	Continuous
17	Preoperative creatinine, μmol/L	Continuous
18	Preoperative blood urea nitrogen, mmol/L	Continuous
19	Preoperative diuretics use	Binary
20	Years of performing surgery	Categorical
21	Types of surgery	Categorical
22	CPB time, min	Continuous
23	ACC time, min	Continuous
24	Fluid balance, mL	Continuous
25	Type of cardioplegia	Categorical

Abbreviations: ACC aortic cross-clamp, BMI body mass index, BSA body surface area, CPB cardiopulmonary bypass, EF ejection fraction, HCT hematocrit

ISSN: 2047-0525