Table 3 Longitudinal changes of scalp-to-cortex distance of left M1 and DLPFC
Geometric measures | NA adults (n = 32) | MCI converters (n = 22) | t value | p value |
|---|---|---|---|---|
Left M1 | ||||
 SCD (mm) | ||||
  Baseline | 16.48 ± 3.01 | 16.14 ± 2.93 | 0.403 | 0.689 |
  1st year FU | 15.99 ± 2.66 | 15.42 ± 2.11 | 0.795 | 0.431 |
  3rd year FU | 16.16 ± 2.52 | 16.28 ± 3.21 | − 0.144 | 0.886 |
 Left DLPFC | ||||
  SCD (mm) | ||||
   Baseline | 14.97 ± 2.98 | 14.75 ± 2.15 | 0.557 | 0.581 |
   1st year FU | 15.06 ± 2.62 | 14.86 ± 2.37 | 0.281 | 0.781 |
   3rd year FU | 15.15 ± 2.63 | 15.74 ± 2.03 | − 1.855 | 0.083 |