Table 2. Slopes of regression fit and unpaired t-test between the two groups of vertices, the group of gyral vertices with positive MPC values vs. the group of sulcal vertices with negative MPC values, in terms of their cortical growth rates.

Gyral Vertices Mean ± Std	Sulcal Vertices Mean ± Std	p-value (Right Tail)	p-value (Two Tails)
0.35 ± 0.26	0.10 ± 0.26	4.31 × 10−98	2.16 × 10−98

It is noted that this analysis is only performed on the vertices, whose cortical thickness curves are well fitted by the linear regression model (R² ≥ 0.6).