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Table 1 Characteristics of orthopedic surgery patients in this study

From: Low serum cholinesterase predicts complication risk after orthopedic surgery in elderly patients: an observational pilot study

   Postoperative complications  
Total Yes No P value
Number 313 49 264  
Age, years
 65–74 years 95 9 86  
 75–89 years 171 26 145 0.011
 ≥ 90 years 47 14 33  
Gender, female 221 29 192 0.062
BMI, kg/m2
 18.5–24.9 kg/m2 206 33 173  
 < 18.5 kg/m2 39 12 27 0.004
 > 25.0 kg/m2 67 4 63  
Comorbidities
 Anemia 37 10 27 0.054
 Hypertension 163 23 140 0.44
 Dyslipidemia 88 9 79 0.12
 Diabetes mellitus 48 7 41 1
 ASA class ≥ 3 104 27 77 < 0.001
 Glucocorticoids use 10 2 8 0.66
Organ impairment
 COPD requiring medication 1 0 1 1
 History of HF or IHD 25 8 17 0.038
 Liver failure 7 1 6 1
 ESRD 9 1 8 1
Operative indication
 Upper limb fracture 73 2 71 0.002
 Lower limb fracture 137 31 106
 Spinal/pelvic fracture 8 1 7
 Osteoarthritis 28 3 25
 Spinal surgery 28 6 22
 Others 39 6 33
Surgical procedure
 Operative time ≥ 2 h 58 9 49 1
 Bleeding volume ≥ 500 mL 13 3 10 0.44
 Emergency 20 3 17 1
Anesthetic procedure
 Spinal 15 3 12 0.71
 General 298 46 252
Postoperative analgesia
 Parenteral analgesics as needed 103 20 83 0.17
 Peripheral nerve blocks 151 18 133
 PCA 47 11 36
 PCA combined with nerve blocks 5 0 5
 Epidural analgesia 7 0 7
Perioperative blood transfusion 68 19 49 0.004
  1. Statistical comparisons were performed using the Fisher’s exact test. ASA American Society of Anesthesiologists, COPD chronic obstructive pulmonary disease, DM diabetes mellitus, eGFR estimated glomerular filtration rate, ESRD end-stage renal disease, HF heart failure, HTN hypertension, IHD ischemic heart disease, PCA patient-controlled analgesia