Table 3.

Summary of tests for potential confounding variables.

With LGI as the dependent measure
Variable or Covariate	Size (mm2)	Number of vertices	Vertex Coverage Percentage
Study Site	19,782	40,730	14.3%
TIV	0	0	0
Gender	5533	11,667	4.1%
Age	22,195	47,165	17.0%

With CT as the dependent measure
Variable or Covariate	Size (mm2)	Number of vertices	Vertex Coverage Percentage
Study Site	56,376	106,188	37.4%
TIV	2269	2881	1.0%
Gender	0	0	0
Age	17,254	31,082	11.0%

With Cortical Volume as the dependent measure
Variable or Covariate	Size (mm2)	Number of vertices	Vertex Coverage Percentage
Study Site	84,368	162,971	57.3%
TIV	937	2185	0.7%
Gender	0	0	0
Age	53,653	99,261	35%

With Cortical Surface Area as the dependent measure
Variable or Covariate	Size (mm2)	Number of vertices	Vertex Coverage Percentage
Study Site	61,853	119,425	42%
TIV	0	0	0
Gender	0	0	0
Age	40,326	72,779	25.4%

NOTE: Monte Carlo Z Simulation test was applied for multiple comparisons. Confidence interval was 90% for all clusters.