Table 4. Comparative of MAE in centimetres between the best regression models analysed and different normalization of the data input and output.

Best values are marked in bold.

Regression model	No scaling	Standard on input	MinMax on input	MinMax on I/O
GBR 10-fold	1.8564	1.8564	1.8539	1.854
Extra trees 10-fold	2.0052	1.9969	1.9857	2.0119
SVM 10-fold	4.3581	1.8471	1.8195	21.5391
CatBoost 10-fold	1.7954	1.7920	1.7710	1.7824