Table 1.

Characteristics of the studied groups.

	NSH		Control		Frontal agenesis		Control		Lateral agenesis		Control
	n	Mean age	n	Mean age	n	Mean age	n	Mean age	n	Mean age	n	Mean age
Male	27	15.51 ± 4.54	27	15.40 ± 3.82	13	19.07	13	18.78	12	15.61	12	15.40
Female	70	17.98 ± 7.84	70	17.80 ± 8.00	29	±7.62	29	±8.25	35	±6.00	35	±5.49
Total	97		97		42		42		47		47