Table 2.

Pearson’s correlation coefficient between predicted and actual amount of blood transfused, based on different prediction methods

Prediction method	Correlation coefficient	p value
Number of ordered units	0.21	<0.0001
Mean transfused volume of the current center	0.34	<0.0001
Mercuriali algorithm	0.39	<0.0001
Predictive modelling	0.61	<0.0001