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Table 1 Descriptive statistics for main outcomes and candidate predictor variables for derivation group and validation group

From: Rapid preoperative predicting tools for 1-year mortality and walking ability of Asian elderly femoral neck fracture patients who planned for hip arthroplasty

Items Derivation group (N = 528) Validation group (N = 175) P
Main outcomes    
 Mortality at the 1st postoperative year (%/n) 22.0% (116) 27.4% (48) 0.142
 Free walking rate at the 1st postoperative year (%/n) 58.4% (308) 53.7% (94) 0.273
Candidate predictors    
 Demographic variables    
  Age (Year) 77.9 ± 8.4 77.7 ± 7.6 0.774
  Gender (Male) 24.5% (129) 20.0% (35) 0.225
  Resident (Downtown) 82.7% (436) 82.3% (144) 0.893
  Medical insurance (No) 40.2% (212) 42.3% (74) 0.631
  Marriage (With spouse) 72.7% (383) 69.1% (121) 0.368
  Smoking history (No) 81.2% (429) 80.6% (141) 0.843
  Fragility fractures history (No) 94.5% (498) 92.6% (162) 0.352
  Dementia (No) 90.7% (479) 87.4% (153) 0.211
 Preoperative walking ability (ref: Bedridden)    0.847
  Need assistance 25.4% (134) 27.4% (48)  
  Free walking 62.9% (332) 61.7% (108)  
 Surgery-related variables    
  Time from injury to diagnosis (Days) 13.9 ± 20.24 17.7 ± 32.7 0.065
  CCI score (≤ 4) 56.7% (299) 56.6% (99) 0.970
  Vital sign (Normal) 69.6% (367) 68.0% (119) 0.684
  Electrocardiogram (Normal) 38.1% (201) 38.3% (67) 0.973
  Chest radiograph (Normal) 22.2% (117) 22.3% (39) 0.981
  Baseline GLU (mmol/L) 6.34 ± 2.28 6.64 ± 2.64 0.153
  Baseline HGB (g/L) 116.3 ± 17.7 113.9 ± 18.5 0.117
  Baseline ALB (g/L) 33.7 ± 4.57 33.9 ± 4.7 0.576
  Baseline INR 1.14 ± 0.97 1.10 ± 0.25 0.628
  Surgical procedure (THA) 38.1% (201) 33.7% (59) 0.293
Anesthesia procedure (SA)    0.910
  PNB 32.3% (170) 35.4% (62)  
  GA 9.3% (49) 13.6% (21)  
  Perioperative complications (No) 88.1% (465) 89.7% (157) 0.554
  1. Note: THA total hip arthroplasty, SA spinal anesthesia, PNB peripheral nerve block, GA general anesthesia