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Table 2 Baseline demographic and clinical (OR and ICU) data on transfused (n = 137) and not transfused patients (n = 55).

From: Intra-operative intravenous fluid restriction reduces perioperative red blood cell transfusion in elective cardiac surgery, especially in transfusion-prone patients: a prospective, randomized controlled trial

  Group Statistics Independent samples tests
  Transfusion Levene's test t-test for equality of means (equal variances assumed)
   mean ± SD Sig. Sig (2-tailed) Mean differ. Std error differ. 96% CI* lower/upper
Age NO 63.6 ± 9.8 0.007 0.016 -3.09 1.27 -5.59/0.58
  YES 66.7 ± 7.1      
Weight NO 79.3 ± 11.2 0.563 0.020 4.09 1.75 0.64/7.55
  YES 75.2 ± 10.9      
Height NO 171.0 ± 6.2 0.12 0.000 4.94 1.19 2.60/7.29
  YES 166.1 ± 7.9      
BMI NO 27.1 ± 3.2 0.442 0.745 -0.17 0.53 -1.22/0.88
  YES 27.2 ± 3.4      
BSA NO 1.90 ± 0.15 0.949 0.001 0.90 0.02 0.04/0.14
  YES 1.81 ± 0.16      
pre-op. Hct NO 42.1 ± 3.78 0.81 0.000 2.42 0.64 1.16/3.69
  YES 39.6 ± 4.10      
discharge Hct NO 32.8 ± 2.21 0.829 0.586 -1.19 0.35 -0.87/0.49
  YES 33.0 ± 2.15      
  1. * Confidence interval of the difference