Table 2 Univariate and multivariate logistic analyses

Age (years) (≥ 75 vs < 75)

5.707

2.644, 12.321

0.000

2.889

1.149,7.264

0.024

Gender (male vs female)

2.106

1.058, 4.191

0.034

2.368

1.066,5.261

0.034

ASA (III/IV vs I/II)

6.085

3.039, 12.186

0.000

1.960

0.818,4.698

0.131

NYHA (III/IV vs I/II)

5.402

2.110, 13.829

0.000

0.981

0.279,3.451

0.976

Operative type (hip replacement vs others)

1.458

0.952, 2.234

0.083

Education (Illiteracy vs primary school and higher)

1.130

0.714, 1.788

0.601

Alcohol (yes vs no)

1.335

0.461, 3.872

0.594

Comorbidity

CAD (yes vs no)

2.0332

0.766, 5.392

0.155

Hypertension (yes vs no)

1.367

0.694, 2.692

0.365

Arrhythmia (yes vs no)

3.253

1.621, 6.528

0.001

1.143

0.480,2.721

0.763

Pulmonary disease (yes vs no)

5.114

2.568, 10.185

0.000

2.132

0.945,4.806

0.068

DM (yes vs no)

0.290

0.039, 2.140

0.225

Preoperative cognitive impairment (yes vs no)

33.438

12.535, 89.200

0.000

13.587

4.360,42.338

0.000

Preoperative blood test

Cr (≥ 96 mmol/l vs < 96 mmol/l)

3.448

1.278, 9.307

0.015

1.999

0.623,6.411

0.244

Hb (< 110 g/L vs ≥ 110 g/L)

3.217

1.624, 6.372

0.001

1.640

0.684,3.933

0.268

WBC (≥ 10*10⁹ vs < 10*10⁹)

1.773

0.719, 4.372

0.214

NLR (≥ 5 vs < 5)

2.886

1.372, 6.074

0.005

1.446

0.632,3.311

0.383

Anesthesia method (GA vs others)

0.725

0.344, 1.527

0.398

Preoperative sedation (yes vs no)

0.984

0.455, 2.128

0.967

Operation time (≥ 150 min vs < 150 min)

1.335

0.616, 2.893

0.465

Bleeding (≥ 200 ml vs < 200 ml)

2.203

0.751, 6.467

0.151

Fluid infusion (≥ 1200 ml vs < 1200 ml)

2.158

1.055, 4.4153

0.035

2.032

0.860,4.804

0.106

Transfusion (yes vs no)

3.362

1.688, 6.696

0.001

1.048

0.423,2.600

0.919

Postoperative pain (yes vs no)

0.807

0.309, 2.111

0.663

Postoperative analgesia (systematic admission vs others)

1.303

0.809, 2.100

0.275

ICU (yes vs no)

1.979

0.453, 8.645

0.364