Table 2.

Results from the experiments with the best-performing models: GoogLeNet and ResNet-50.

Gender, model	Subject age groupa in years, MAEb (SD)
	14	15	16	17	18	19	20	21
Men, GoogLeNet	0.74 (0.50)	0.73 (0.80)	0.99 (1.07)	0.98 (1.17)	1.14 (1.19)	0.55 (0.70)	0.51 (0.49)	1.37 (0.59)
Men, ResNet-50	0.58 (0.50)	0.75 (0.92)	0.95 (1.11)	1.15 (1.38)	1.18 (1.18)	0.54 (0.72)	0.66 (0.63)	1.51 (0.57)
Women, GoogLeNet	0.75 (0.56)	0.89 (1.05)	1.57 (1.08)	1.09 (1.34)	0.61 (0.70)	0.54 (0.55)	1.25 (0.73)	1.75 (0.62)

^aAge group X refers to an age span from X to X.5 (eg, the age group 14 refers to an age span of 14 to 14.5 years).

^bMAE: mean absolute error.