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.

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)


T: tube; C: centrifugation condition as listed under section 2: Patients, materials and methods.

Minder et al. BMC Clinical Pathology 2011 11:6   doi:10.1186/1472-6890-11-6

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