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Table 3 Univariate logistic regression analysis for postoperative delirium

From: Electrolyte disorders and aging: risk factors for delirium in patients undergoing orthopedic surgeries

Characteristic B a S.E.b Wald P-value ORc 95% CId
Gender       
 Male 1.000
 Female −0.053 0.256 0.043 0.835 0.948 (0.574, 1.566)
Age (years)    38.093 <0.001   
 <70 1.000
 70–79 2.709 0.738 13.478 <0.001 15.007 (3.534, 63.724)
 ≥80 3.819 0.733 27.126 <0.001 45.540 (10.822,191.637)
Blood type    4.949 0.176   
 A 1.000
 B −0.234 0.330 0.500 0.479 0.792 (0.414, 1.513)
 AB −1.070 0.511 4.383 0.036 0.343 (0.126, 0.934)
 O −0.020 0.304 0.004 0.947 0.980 (0.540, 1.779)
Type of surgery    29.940 <0.001   
 IFIF 1.000
 FHR 0.458 0.294 2.420 0.120 1.580 (0.888, 2.813)
 THA −1.210 0.389 9.689 0.002 0.298 (0.139, 0.639)
 TKA −1.472 0.469 9.872 0.002 0.229 (0.092, 0.575)
Anesthesia       
 General anesthesia 1.000
 Epidural anesthesia 0.265 0.560 0.224 0.636 1.304 (0.435, 3.909)
Preoperative hospitalization (d)    32.560 <0.001   
 1–3 1.000
 4–6 1.522 0.294 26.807 <0.001 4.580 (2.575, 8.148)
 ≥7 0.175 0.372 0.223 0.637 1.192 (0.575, 2.469)
Preoperative comorbidities    6.004 0.111   
 0 1.000
 1 0.302 0.291 1.075 0.300 1.352 (0.764, 2.392)
 2 0.162 0.357 0.205 0.650 1.176 (0.584, 2.369)
 ≥3 1.107 0.459 5.825 0.016 3.026 (1.231, 7.436)
Preoperative albumin (g/L)    14.368 0.001   
 <35 1.000
 35–39 0.000 0.341 0.000 1.000 1.000 (0.513, 1.950)
 ≥40 −1.061 0.379 7.838 0.005 0.346 (0.165, 0.727)
Preoperative hemoglobin (g/L)       
Anemic (male, <120; female, <1 l0) 1.000
Normal (male, ≥120; female, ≥110) −0.607 0.262 5.343 0.021 0.545 (0.326, 0.912)
Postoperative electrolyte disorders       
 No 1.000
 Yes 0.663 0.263 6.354 0.012 1.941 (1.159, 3.249)
Blood loss (mL)    3.905 0.142   
 <200 1.000
 200–399 −0.260 0.264 0.971 0.324 0.771 (0.460, 1.293)
 ≥400 −0.866 0.456 3.606 0.058 0.421 (0.172,1.028)
Operation time (min)    19.298 <0.001   
 <60 1.000
 60–89 −0.345 0.333 1.074 0.300 0.708 (0.369, 1.360)
 ≥90 −1.666 0.417 15.963 <0.001 0.189 (0.084, 0.428)
Postoperative ICU care       
 No 1.000
 Yes 1.005 0.256 15.443 <0.001 2.731 (1.655, 4.507)
Blood transfusion (mL)    5.618 0.060   
 <600 1.000
 600–1199 0.666 0.281 5.618 0.018 1.947 (1.122, 3.379)
 ≥1200 0.290 0.333 0.758 0.384 1.336 (0.696, 2.564)
  1. aRegression coefficient
  2. bStandard error
  3. cOdds ratio
  4. d95% confidence interval