Table 3.

Full intelligence quotient and learning-memory differences.

	High-risk preterm n = 16 Mean ± SD			Low-risk preterm n = 20 Mean ± SD	Full-term n = 22 Mean ± SD	F-Snedecor statistic (p)	${\eta }_p^2$
Wechsler intelligence scale for children IV
Verbal Comprehension	106.3 ± 13.29			107.25 ± 15.15	123.73 ± 19.04	7.38 (.001)*	.21
Perceptual Reasoning	94.9 ± 14.52			101.10 ± 13.59	115.64 ± 16.65	9.76 (< .001)*	.26
Working Memory	102.6 ± 13.90			107.60 ± 15.24	108.50 ± 16.25	0.77 (.46)	.03
Processing Speed	98.9 ± 13.02			107.25 ± 14.49	114.50 ± 8.85	7.62 (.001)**	.22
FIQ	99.7 ± 14.55			105.75 ± 13.76	121.91 ± 15.39	12.13 (< .001)*	.31
Rey auditory verbal learning test (covariate according to age)
A1	4.84 ± 1.26			5.46 ± 1.28	6.02 ± 1.20	3.30 (.027)**	.16
A2	6.92 ± 2.16			8.73 ± 1.98	8.49 ± 1.77	4.38 (.008)***	.20
A3	8.45 ± 3.05			10.69 ± 2.08	10.78 ± 1.75	5.98 (.001)***	.25
A4	10.04 ± 3.47			11.60 ± 2.31	12.11 ± 1.46	5.44 (.002)**	.23
A5	10.79 ± 3.05			12.68 ± 1.69	12.90 ± 1.08	5.39 (.003)***	.23
Learning	41.03 ± 11.22			49.15 ± 7.93	50.30 ± 5.35	7.39 (< .001)***	.29
Delayed Recall	7.99 ± 4.14			10.97 ± 2.09	11.40 ± 1.50	6.00 (.001)***	.25
Memory	-0.75 ± 1.23			0.21 ± 0.76	0.35 ± 0.48	7.67 (< .001)***	.30

SD: standard deviation; FIQ: full intelligence quotient; WISC-IV: Wechsler Intelligence Scale for Children IV; RAVLT: Rey Auditory Verbal Learning Test; A1, A2, A3, A4 and A5: RAVLT trials; and ${\eta }_p^2$: partial eta squared.

*Statistically significant differences between High-risk preterm < Full-term and Low-risk preterm < Full-term.

**Statistically significant differences between High-risk preterm < Full-term.

***Statistically significant differences between High-risk preterm < Full-term and High-risk preterm < Low-risk preterm.