Fig. 3

Visual representation of scenario 2, stepwise etiological syndrome diagnosis, making use of letter-value plots. NOTE: The figure includes letter-value plots for DSI scores. The length of the first box represents the interquartile range (IQR), which contains the middle 50% of the data in the group, the second box (E) 12.5% at each end, the third box covers (D) 6.25% on each end, and the fourth box (C) 3.13%. The longer the box, the greater the variability. The percentages indicate the proportion of the total population that requires additional testing. Red dashed lines depict the DSI cutoff-vales. MCI: mild cognitive impairment, MRI: magnetic resonance imaging