Table 1 Patients’ characteristics

Sociodemographic data

Age (IQR), years

81(75–89)

Sex(male), n (%)

413(33.3%)

Past medical history

 Hypertension, n (%)

718(57.8%)

 Diabetes mellitus, n (%)

351(28.3%)

 Cardiac dysrhythmia, n (%)

138(11.1%)

 Stroke, n (%)

389(31.3%)

 Coronary heart disease, n (%)

306(24.6%)

 Heart failure, n (%)

69(6.2%)

 Renal insufficiency, n (%)

66(5.3%)

Post-injury factors

 admission to operating time (IQR), days

32.00 ± 18.40

 fracture type

  Intertrochanteric

705(56.8%)

  Femoral neck

537(43.2%)

 Neutrophils (10⁹/L) (IQR) 6.50(5.20–8.10)

 Lymphocytes (10⁹/L) (IQR) 1.20(0.90–1.60)

 NLR at admission 5.28(3.75–7.61)

Length of stay (IQR), days 11.00(9.00–15.00)

Surgery related factors

 Anesthesia

  general anesthesia

370(29.8%)

  Regional anesthesia

872(70.2%)

 Type of surgery

192 (54.2%)

  Intramedullary nail

639(51.4%)

  Sliding hip screw

65 (5.2%)

  Hip arthoplasty

372 (30.0%)

  Cancellous screws 166 (13.4%)

 Perioperative complications 188(15.1%)

Delirium

177 (14.3%)

 Time of occurrence

  Occurs within 1–3 days after surgery

142(80.2%)

  Occurs after 3 days after surgery

35(19.8%)

 Duration

4.72 ± 2.56d

  Symptoms last for 1–3 days

107(60.5%)

  Symptoms last for 4–7 days

58(32.8%)

  Symptoms last more than 7 days

12(6.8%)