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Table 3 Risk factors for allogeneic blood transfusions

From: Total knee Arthroplasty: risk factors for allogeneic blood transfusions in the South Asian population

Variable Odds Ratio (95% CI) Univariate analysis p-value Adjusted Odds Ratio (95% CI) Multivariate analysis p-value
Type of Surgery   <0.001   <0.001
 Unilateral 1   1  
 Bilateral 4.34 (2.81, 6.69)   5.51 (3.34, 9.01)  
ASA   0.007   0.009
 Low Risk (1–2) 1   1  
 High Risk (3–4) 1.73 (1.16, 2.58)   1.92 (1.18, 3.14)  
Pre-op Haemoglobin   <0.001   <0.001
 Normal 1   1  
 Low 2.20 (1.52, 3.20)   4.15 (2.48, 6.96)  
Sex   0.049   <0.001
 Male 1   1  
 Female 1.59 (1.00, 2.52)   3.44 (1.84, 6.43)  
BMI   0.098   0.008
 > 30 (Obese) 1   1  
 ≤ 30 (non-Obese) 1.37 (0.94, 2.00)   1.79 (1.17, 2.76)  
No. of co-morbidities   0.048   0.379
 None 1   1  
 1 0.88 (0.56, 1.38)   0.84 (0.49, 1.42)  
 2 1.32 (0.82, 2.12)   1.06 (0.60, 1.87)  
 3 1.54 (0.79, 2.99)   1.15 (0.51, 2.58)  
 4 5.44 (1.25, 23.61)   4.10 (0.81, 20.77)  
Age   0.825   
 < 60 years 1    
 ≥ 60 years 1.04 (0.72, 1.50)