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Table. 1 Patient characteristics and surgical data between the PD and non-PD groups

From: Preoperative prognostic nutritional index is useful factor for predicting postoperative delirium after primary total joint arthroplasty

  PD group Non-PD group P
Number of subjects 67 927  
Age range (years) 71.1 ± 9.6 66.4 ± 9.7 < 0.01*
BMI 24.2 ± 3.6 23.8 ± 3.6 0.41
Sex (male vs. female) 18 vs. 49 268 vs. 659 0.72
Alcohol consumption 15/67 (22.4 %) 142/927 (15.3 %) 0.13
Current smoking 8/67 (11.9 %) 111/927 (12.0 %) 0.99
ASA physical status
  I-II 40/67 (59.7 %) 611/927 (65.9 %) 0.30
  III-IV 27/67 (40.3 %) 316/927 (34.1 %) 0.30
Preoperative complications
  Hypertension 24/67 (35.8 %) 225/927 (24.3 %) 0.04*
  Stage 1 (SBP: 140–159 mmHg; DBP: 90–99 mmHg) 3/67 (4.5 %) 111/927 0.06
  Stage 2 (SBP: 160–179 mmHg; DBP: 100–109 mmHg) 11/67 (16.4 %) 71/927 0.01
  Stage 3 (SBP ≥ 180 mmHg; DBP ≥ 110 mmHg) 10/67 (14.9 %) 43/927 < 0.01
  Diabetes mellitus 10/67 (14.9 %) 110/927 (11.9 %) 0.46
  Heart disease 5/67 (7.5 %) 43/927 (4.6 %) 0.30
  Chronic renal dysfunction 3/67 (4.5 %) 45/927 (4.9 %) 0.89
Current medication
  Steroid 3/67 (4.5 %) 47/927 (5.1 %) 0.83
  Immunosuppressant 2/67 (3.0 %) 18/927 (1.9 %) 0.56
  Anticoagulation 12/67 (17.9 %) 136/927 (14.7 %) 0.47
  β-blockers 19/67 (28.4 %) 187/927 (20.2 %) 0.11
  ACEIs 7/67 (10.4 %) 58/927 (6.3 %) 0.18
Surgical data
  Type of operation (THA vs. TKA) 28 vs. 39 500 vs. 427 0.05
  Operative time (min) 112.1 ± 42.7 98.5 ± 38.4 < 0.01*
  Anesthesia time (min) 172.8 ± 45.7 159.1 ± 42.3 0.01*
  Intraoperative blood loss (ml) 308.4 ± 78.7 292.1 ± 83.6 0.11
  Blood transfusion 7/67 (10.4 %) 60/927 (6.5 %) 0.21
Postoperative complications
  Surgical site infection 13/67 (19.4 %) 36/927 (3.9 %) < 0.01*
  Hematoma 2/67 (3.0 %) 25/927 (2.7 %) 0.89
  Deep vein thrombosis 5/67 (7.5 %) 41/927 (4.4 %) 0.25
  Dislocation 1/67 (1.5 %) 10/927 (1.1 %) 0.76
  Periprosthetic fracture 1/67 (1.5 %) 3/927 (0.3 %) 0.14
  1. *Statistically significant difference between the PD and non-PD groups
  2. PD Postoperative delirium; BMI Body mass index; PNI Prognostic nutritional index; TKA Total knee arthroplasty; THA Total hip arthroplasty; ASA American society of anesthesiologists; ACEIs Angiotensin-converting enzyme inhibitors; P P-value