Table 2. Comparison of performance of different methods in predicting 24-month (M24) clinical scores of MCI patients, by using different numbers of longitudinal data.

Method	MMSE		ADAS-Cog
	CORR	RMSE	CORR	RMSE
CONCAT (bl)	0.635±0.049	2.541±0.100	0.657±0.038	4.771±0.146
Ensemble (bl)	0.666±0.039	2.637±0.081	0.677±0.037	4.943±0.155
Proposed (bl)	0.659±0.043	2.457±0.123	0.682±0.044	4.763±0.084
Proposed (bl+M06)	0.702±0.037	2.344±0.097	0.746±0.028	4.318±0.173
Proposed (bl+M06+M12)	0.743±0.024	2.177±0.113	0.768±0.025	4.097±0.126
Proposed (bl+M06+M12+M18)	0.786±0.013	2.035±0.076	0.777±0.027	4.004±0.086

The reported values are the correlation coefficient (CORR) and the root-mean-square error (RMSE), averaged on 10-fold tests (with standard deviation also reported).

MMSE = Mini-Mental State Examination, ADAS-Cog = Alzheimer's Disease Assessment Scale - Cognitive Subscale.