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Table 1 Patient characteristics, stratified by time-to-surgery

From: The effect of time-to-surgery on outcome in elderly patients with proximal femoral fractures

Group I II III p-value (group comparison)
Time from fracture to surgery ≤ 12 h > 12 h to ≤ 36 h > 36 h  
Cases (total = 2916) n = 802 n = 1191 n = 923  
Female (2324; 79.7%) n (%) 654 (81.6) 953 (80.0) 717 (77.7) 0.13
Age in years (mean, std) interquartile range 82.4 (7.5) 82.4 (7.5) 81.5 (7.2) 0.009 (I/II: n.s.; I/III: 0.04; II/III: 0.01)
  77.2–88.8 77.3–88.5 76.8–87.2  
Patients ≥ 85 years n (%) 308 (38.4) 455 (38.2) 289 (31.3) 0.001
ASA classificationA     
   ASA I/II n (%) 324 (40.4) 454 (38.3) 298 (32.3)  
   ASA III n (%) 447 (55.7) 685 (57.7) 554 (60.1)  
   ASA IV/V n (%) 31 (3.9) 48 (4.0) 70 (7.6) < 0.001
Body mass index (kg/m2)     
   < 25 462 (60.7) 669 (60.5) 544 (62.6)  
   25–29.9 235 (30.9) 340 (30.8) 251 (28.9)  
   ≥ 30 64 (8.4) 96 (8.7) 74 (8.5) 0.88
Smoking status     
   Non-smoker 676 (90.6) 981 (89.2) 759 (88.1)  
   Smoker 70 (9.4) 119 (10.8) 103 (11.9) 0.25
Arterial hypertension     
   No 256 (32.6) 363 (30.9) 288 (31.5)  
   Yes 530 (67.4) 812 (69.1) 625 (68.5) 0.74
Diabetes mellitus     
   No 594 (75.7) 918 (78.4) 674 (74.6)  
   Yes 191 (24.3) 253 (21.6) 230 (25.4) 0.10
Myocardial infarction     
   No 701 (93.0) 1016 (91.4) 788 (91.7)  
   Yes 53 (7.0) 96 (8.6) 71 (8.3) 0.44
PAOD B     
   No 595 (80.7) 872 (78.4) 673 (77.4)  
   Yes 142 (19.3) 240 (21.6) 196 (22.6) 0.26
Stroke     
   No 640 (86.5) 949 (85.8) 716 (82.9)  
   Yes 100 (13.5) 157 (14.2) 148 (17.1) 0.08
COPD C     
   No 658 (87.0) 976 (86.5) 780 (88.3)  
   Yes 98 (13.0) 153 (13.5) 103 (11.7) 0.45
Malignancy     
   No 641 (88.4) 975 (90.8) 764 (89.2)  
   Yes 84 (11.6) 99 (9.2) 93 (10.8) 0.24
Creatinine > 2 mg/dl     
   No 706 (91.9) 1027 (90.5) 799 (90.0)  
   Yes 62 (8.1) 108 (9.5) 89 (10.0) 0.37
Type of admission     
   from own home 612 (77.0) 927 (78.0) 677 (73.6)  
   from nursing institution 152 (19.1) 223 (18.8) 177 (19.2)  
   from clinic/hospital 31 (3.9) 38 (3.2) 66 (7.2) < 0.001
  1. n.s. = not significant
  2. A American Society of Anesthesiologists ratings; B peripheral arterial occlusive disease; C Chronic obstructive pulmonary disease