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Total knee arthroplasty data
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OR/estimate (95% CI)
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Comparison P value
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Global P value
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Bivariate analysisa
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Previous iron transfusion
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13 (3, 56)
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0.0007
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Multivariable analysis for outcome: blood transfusiona
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Late pre-operative haemoglobin
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0.80 (0.70, 0.91)a
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0.0010
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Multivariable analysis for outcome: blood loss
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Type of anaesthesia
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0.0111
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Spinal/GA vs GA
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−111.4 (−185.6, −37.4)
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0.0032
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Spinal vs GA
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−71.3 (−135.2, −7.5)
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0.0286
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Anticoagulants
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<.0001
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0 vs 2b
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−274 (−417, −130)
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0.0002
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0 vs 3b
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−232.7 (−403.0, −62.5)
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0.0074
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Multivariable analysis for outcome: haemoglobin drop
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BMI
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−0.02 (−0.04, 0.0)
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0.0120
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Gender (male vs female)
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−0.35 (−0.56, −0.15)
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0.0007
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Anticoagulants
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0.0288
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0 vs 2b
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−0.67 (−1.26, −0.08)
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0.0249
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1 vs 2b
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−1.44 (−2.41, −0.48)
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0.0034
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Late pre-operative haemoglobin
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0.02 (0.01, 0.03)
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<.0001
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- aBinary logistic regression – odds ratio (95% confidence interval); modelling the probability that blood transfusion = ‘Yes’
- bAnti coag (0 = Clexane, 1 = aspirin, 2 = warfarin, 3 = all others [rivaroxaban, apixaban])
