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Table 3 Tests with confidence intervals of both proportional and constant bias exceeding the confidence interval and indicating a possible lack of identity between test and reference method.

From: Effects of different centrifugation conditions on clinical chemistry and Immunology test results

Parameter Condition Constant bias Proportional bias
Bilirubin direct T 22; C 1 : C 2 0.12 (0.06 to 0.18) 0.99 (0.98 to 0.99)
Bilirubin total T 11; C 2 : C 3 0.24 (0.04 to 0.44) 0.96 (0.94 to 0.99)
Calcium T 11; C 1 : C 3 -0.18 (-0.33 to -0.02) 1.08 (1.01 to 1.15)
Folic acid T 22; C 2 : C 3 0.98 (0.24 to 1.72) 0.95 (0.91 to 0.99)
Iron T 22; C 1 : C 3 -0.22 (-0.43 to -0.02) 1.02 (1.01 to 1.03)
Transferrin T 22; C 2 : C 3 -0.84 (-1.67 to -0.02) 1.04 (1.01 to 1.06)
  1. T: tube; C: centrifugation condition as listed under section 2: Patients, materials and methods.