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Table 4 Relative risk of complications in the 30-day postoperative period for patients undergoing primary total knee arthroplasty

From: Does dehydration prior to primary total joint arthroplasty increase risk of perioperative complications?

Adverse Event RRa 99.7% CI P-valueb
Any Complications 0.97 0.92–1.03 0.138
Urinary tract infection 1.09 0.96–1.23 0.040
Blood transfusion 1.02 0.96–1.07 0.408
Extended length of stay (> 3 days) 0.94 0.910.97  < 0.001
Readmission 0.91 0.860.97  < 0.001
Death 1.00 0.72–1.39 0.973
Pneumonia 0.88 0.73–1.07 0.059
Return to the operating room 0.91 0.82–1.01 0.007
Wound complications 0.98 0.88–1.09 0.586
Thromboembolic complicationsc 0.99 0.90–1.09 0.825
Sepsis/septic shock 0.92 0.74–1.16 0.303
Respiratory complications 0.91 0.68–1.21 0.322
Cardiac complications 1.00 0.81–1.23 0.993
Renal complications 0.83 0.63–1.10 0.047
Stroke/cerebrovascular accident 1.03 0.70–1.51 0.805
  1. aPoisson regressions with robust error variance were used to compare these variables. Adjusted for age, gender, BMI, ASA class, diabetes, and smoking status
  2. bBold fonts indicate statistical significance (significant at P < 0.003 due to Bonferroni correction for multiple comparisons). RR Relative risk, CI Confidence interval (99.70% CI due to Bonferroni)
  3. cIncludes deep vein thrombosis and pulmonary embolism