Table 3.

Comparisons of number of cortical regions with aberrant gyrification between carriers and controls.

	Controls (N = 28)		Carriers (N = 33)		Test statistics
	Mean (SD)	Range	Mean (SD)	Range
Hypergyrification (%)	0.1 (0.3)	0–1.5	1.2 (2.0)	0–8.8	t =  − 3.62, df = 40.6, p = 0.0008
Hypogyrification (%)	0.2 (0.5)	0–1.5	3.6 (6.3)	0–25.0	t =  − 4.19, df = 48.4, p = 0.0001
Total aberrant (%)	0.2 (0.5)	0–1.5	4.7 (6.1)	0–25.0	t =  − 7.12, df = 56.7, p < 0.0001

The t-tests were performed on log transformed data after adding 0.0001 to accommodate zero percentage of regions with aberrant LGI in some participants.