Confusion matrix. Each matrix includes the hits for each ANN processing group (training, validation and test). The embryos were distributed vertically in accordance with the template and horizontally in accordance with the ANN classification. Thus, the diagonal for each matrix (highlighted in green) shows the ANN hits, which is the number of cases where the ANN is consistent with the template. The final item (bottom right in each matrix) shows the percentage of hits (highlighted in green) and error (highlighted in red) for the ANN.