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Table 2 Correlation coefficient and precision of prediction formulas

From: Generation and validation of a formula to calculate hemoglobin loss on a cohort of healthy adults subjected to controlled blood loss

Model

Prediction

Correlation coefficient

Hb equivalent mean absolute error (MAE)

Our formula

HB loss (g)

72.9%

19.6

Mercuriali

RBC loss (mL)

67.7%

20.8

Lisander

RBC loss (mL)

67.7%

20.8

Bourke

Blood loss (mL)

60.5%

20.0

Ward

Blood loss (mL)

58.9%

20.5

Gross

Blood loss (mL)

59.0%

20.5

Meunier

Blood loss (mL)

57.5%

21.0

  1. The novel formula as well as existent prediction formulas were validated against the controlled blood loss cohort, each for the parameter they are supposed to predict. The novel formula is characterized by the highest correlation coefficient and smallest mean absolute error (Hb equivalent MAE; 1 g of Hb ≈ 2.87 mL RBC ≈ 6.79 mL blood loss), i.e. is markedly more accurate than available formulas with approximately equal precision