Table 1 Mean age, University Selection Test scores, socioeconomic and intellectual variables by group and sex.

Variables	Males			Females			Within group comparison
Variables	High SA Group^# (n = 42)	Low SA Group^# (n = 16)	p-value	High SA Group^# (n = 21)	Low SA Group^# (n = 23)	p-value	High SA Group^# p-value	Low SA Group^# p-value
Demographic
Age (y)	18.1 ± 0.3	18.6 ± 0.8	.0003***	18.0 ± 0.3	18.1 ± 0.5	.3582	.4795	.0292*
University Selection Test (PSU) scores
PSU (L + M)	712 ± 41	395 ± 56		672 ± 42	388 ± 55		.0005***	.7209
Language (L)	690 ± 50	403 ± 72		665 ± 53	388 ± 73		.0761	.5317
Mathematics (M)	734 ± 61	390 ± 83		677 ± 69	388 ± 68		.0013**	.9392
Socioeconomic status (SES)
SES (high + medium)	81.0	56.2		84.2	13.0		X_o² = 34.0038 df = 3 p < .0001***
SES (low)	19.0	43.6		15.8	87.0		X_o² = 34.0038 df = 3 p < .0001***
Intellectual ability (IA)
IA (I + II)	97.6	18.8		90.5	4.4		X_o² = 75.5633 df = 3 p < .0001***
IA (III)	2.4	56.2		9.5	60.8
IA (IV + V)	0.0	25.0		0.0	34.8

Data are expressed as mean ± SD, Means were compared by Bonferroni's test;
Data for SES are expressed in percentage of cases for SES categories and compared by Chi-square test.
Data for IA are expressed in percentage of cases for IA categories and compared by Chi-square test. IA grades were pooled in two groups: I + II, and III + IV + V. IA grades: Grade I, superior; Grade II, above average; Grade III, average; Grade IV, below average; Grade V, intellectually deficient. p < .05 *; < .01**; < .001 ***
^# SA: scholastic achievement; High SA Group: High PSU score (> 620, > p75); Low SA Group: Low PSU score (< 450, < p25).

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