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Scatterplots of the predicted brain age in CNN2, 3, and 4 (cross-validation approach). Each dot represents an individual, and the color code used for each cohort is presented in the legend. CNN2 was run using 4 cohorts, CNN3 with 6 cohorts, and CNN4 with 4 cohorts but with skull-stripped images. The red line is the linear regression based on the predicted brain age.
