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Table 2 Characteristics of reoperation and non-reoperation patients

From: Nomogram for predicting reoperation following internal fixation of nondisplaced femoral neck fractures in elderly patients

Characteristics Reoperation, n = 28 (%) Non-reoperation, n = 227 (%) P value
 Gender    0.362
  Male 9 (32.1) 55 (24.2)  
  Female 19 (67.9) 172 (75.8)  
 Age 68.0 (67.0–73.0) 72.0 (67.0–78.0) 0.015*
 Injured side    0.401
  Right 10 (35.7) 100 (44.1)  
  Left 18 (64.3) 127 (55.9)  
 Smoking    0.549
  No 25 (89.3) 210 (92.5)  
  Yes 3 (10.7) 17 (7.5)  
 Alcohol consumption    0.302
  No 26 (92.9) 219 (96.5)  
  Yes 2 (7.1) 8 (3.5)  
 ASA classification    0.411
  I–II 23 (82.1) 199 (87.7)  
  III–IV 5 (17.9) 28 (12.3)  
 Chronic kidney disease    0.435
  No 26 (92.9) 218 (96.0)  
  Yes 2 (7.1) 9 (4.0)  
 Hypertension    0.695
  No 11 (39.3) 98 (43.2)  
  Yes 17 (60.7) 129 (56.8)  
 Diabetes mellitus    0.205
  No 24 (85.7) 170 (74.9)  
  Yes 4 (14.3) 57 (25.1)  
 Charlson’s WIC 3.54 ± 1.26 3.70 ± 1.35 0.541
 Cerebrovascular disease    0.425
  No 23 (82.1) 171 (75.3)  
  Yes 5 (17.9) 56 (24.7)  
 COPD    0.217
  No 24 (85.7) 210 (92.5)  
  Yes 4 (14.3) 17 (7.5)  
 Preoperative functional status    0.713
  Using ambulatory aid 2 (7.1) 21 (9.3)  
  Independent ambulator 26 (92.9) 206 (90.7)  
 Interval to surgery    0.335
  < 72 h 14 (50.0) 81 (35.7)  
  72 - 120 h 7 (25.0) 72 (31.7)  
  > 120 h 7 (25.0) 74 (32.6)  
 Pauwel’s classification    0.031*
  I 7 (25.0) 86 (37.9)  
  II 9 (32.1) 94 (41.4)  
  III 12 (42.9) 47 (20.7)  
 Posterior tilt angle    0.023*
  ≥ 20° 13 (46.4) 59 (26.0)  
  < 20° 15 (53.6) 168 (74.0)  
 Anesthesia type    0.168
  General anesthesia 9 (32.1) 47 (20.7)  
  Regional anesthesia 19 (67.9) 180 (79.3)  
 Surgical time (min) 75.89 ± 39.77 80.68 ± 29.64 0.439
 WBC (>10 × 109 /L) 2 (7.1) 35 (15.4) 0.392
 RBC (< lower limit) a 8 (28.6) 49 (21.6) 0.403
 PLT (> 300 × 109 /L) 2 (7.1) 14 (6.2) 0.841
 LYM (< 1.1 × 109/L) 10 (35.7) 80 (35.2) 0.961
 HGB (< lower limit) b 10 (35.7) 51 (22.5) 0.121
 ALT (> 40 U/L) 4 (14.3) 16 (7.0) 0.251
 AST (> 40 U/L) 4 (14.3) 11 (4.8) 0.045*
 ALP (>125 U/L) 7 (25.0) 21 (9.3) 0.012*
 Na+ (< 135 mmol/L) 7 (25.0) 29 (12.8) 0.080
 TP (< 60 g/L) 8 (28.6) 41 (18.1) 0.183
 ALB (< 35 U/L) 8 (28.6) 29 (12.8) 0.025*
 D-dimer (> 0.5 mg/L) 17 (60.7) 151 (66.5) 0.541
 Interval to weight-bearing 6.39 ± 2.74 8.24 ± 2.73 0.001*
 Harris Hip Score 76.68 ± 7.69 81.59 ± 8.60 0.004*
 VAS 2.57 ± 1.60 1.78 ± 1.30 0.016*
  1. Abbreviations: ASA the American Society of Anesthesiologists, WIC Charlson’s weighted index of comorbidities, COPD chronic obstructive pulmonary diseases, WBC white blood cell, RBC red blood cell, PLT platelet, LYM lymphocyte, HGB hemoglobin, ALT alanine transaminase, AST aspartate transaminase, ALP alkaline phosphatase, Na+ serum sodium concentration, TP total protein, ALB albumin
  2. *: Statistically significant difference
  3. a Reference range: women 3.5–-5.0 × 1012/L, men 4.0–-5.5 × 1012/L
  4. b Reference range: women 110–-150 g/L, men 120–-160 g/L