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Table 1 Predictors of 30-day- and 6-months-mortality and survival time. Apparently valve size is a risk factor in the first step of the analysis. However, after adjustment for gender, age, BSA, BMI and body size, valve size disappeared (p < 0.05)

From: Effect of surgeon on transprosthetic gradients after aortic valve replacement with Freestyle® stentless bioprosthesis and its consequences: A follow-up study in 587 patients

  Models for
Preoperative risk factors 30-day mortality 6-months mortality Survival time
  OR 95% CI OR 95% CI HR 95% CI
Myocardial decompensation 2.9 1.1–7.2     
Diabetes mellitus    2.7 1.3–5.5 2.0 1.3–3.0
Atrial fibrillation    2.3 1.1–5.2 2.8 1.8–4.4
Peripheral vascular disease      2.2 1.2–4.0
Antithrombine III (%) 0.97 0.94–0.99 0.96 0.94–0.99   
Urea concentration (mg/dl)    1.02 1.01–1.03 1.02 1.011.02
Valve size p = 0.009   p = 0.05   p = 0.02  
After Variable transformation:       
Female and age > 74 years 4.0 1.4–11.0     
BSA < 1.78 m2    3.0 1.51–6.07   
Female and age > 80 years      1.8 1.03–2.94
BMI < 24 and body size < 165 cm      1.7 1.02–2.93
Valve size p = 0.13   p = 0.47   p = 0.22  
  1. CI = Confidential Interval
  2. HR = Hazard Ratio
  3. OR = Odds Ratio
  4. p = p-value of model improvement