Table 4.

Brain-age prediction performance, leaving out single modalities

Excluded modality	Number of entered variables	Correlation between age and brain-age (r)	Variance in age explained (R2)	Mean absolute error (y)	Age bias (correlation between age and age-difference)
All included	1079	0.786	0.618	3.515	−0.650
T1-weighted	914	0.751	0.565	3.752	−0.654
T2-FLAIR	1078	0.778	0.605	3.572	−0.642
T2∗	1065	0.773	0.598	3.598	−0.641
Diffusion-MRI	404	0.715	0.511	3.975	−0.692
Task fMRI	1065	0.781	0.610	3.569	−0.634
Resting-state fMRI	869	0.779	0.607	3.522	−0.615