Shape Prediction of Nasal Bones by Digital 2D-Photogrammetry of the Nose Based on Convolution and Back-Propagation Neural Network

Table 1

Characteristics and standard parameter for input training and validation by 3 specific groups.

Characteristic	Training group	External evaluation group	Internal evaluation group
	()	()	()
Male	88	81	18
Female	1912	101	15
Age
BMI			N/A

. N/A: not available.