Table 3.

Comparison of brain age with different kernel functions for NC-AD (correlation coefficient)

	Polynomial kernel		Gaussian kernel		Linear kernel
	Mean	Std	Mean	Std	Mean	Std
Without age estimation (w = 0, q = 0)	0.059	0.0363	0.0592	0.0363	0.0592	0.0363
BrainAge_estima	0.558	0.0179	0.6746	0.0230	0.518	0.2354
Path_brainAge_estima	0.625	0.0181	0.6785	0.0243	0.682	0.0235