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Table 3 Groups’ performance on IQ, vocabulary, memory and attention tasks

Variables	ASD_MH		ASD_L		n	U	p	g
Variables	Mean	SD	Mean	SD	n	U	p	g
Non-verbal IQ: RPM Standard Score	98.61	15.13	40.66	12.23	33	0.00***	< 0.001	4.17
Expressive Vocabulary: CVS Standard Score	76.11	12.43	3.33	12.91	33	0.00***	< 0.001	5.75
Picture comprehension: DSLD Test Preschool	–	–	2.57	2.95	15	–	–	–
Attention (total score): TAAC Test Percentile	6.33	10.32	0.07	0.26	33	13.00***	< 0.001	.82
Auditory Attention: TAAC Test Percentile	16.66	26.21	0.14	0.35	33	24.00***	< 0.001	.85
Visual Attention: TAAC Test Percentile	10.94	18.47	0.13	0.35	33	7.00***	< 0.001	.79
Visual Attention Range: TAAC Test Percentile	17.67	23.84	0.33	1.29	33	20.50***	< 0.001	.98
VSTM Sentence recall: TAAC Test Percentile	14.28	14.63	0.67	0.26	33	11.50***	< 0.001	1.26
VSTM Word Recall: Memory Test	20.39	7.09	1.07	4.13	33	4.00***	< 0.001	3.25
Immediate Visual Memory: Memory Test	24.44	9.80	4.07	5.23	33	13.50***	< 0.001	2.53
Delayed Visual Memory: Memory Test	4.05	2.34	0.53	1.12	33	24.00***	< 0.001	1.86
Visual Information Recall: Memory Test	6.05	4.64	0.47	0.83	33	32.00***	< 0.001	1.60
Narration Total Elements: Memory Test	5.50	5.54	0.07	0.26	33	25.50***	< 0.001	1.32
Narration Total Sections: Memory Test	4.94	4.99	0.07	0.26	33	32.00***	< 0.001	1.32
Information Retention Factor: Memory Test	5.28	6.06	0.40	1.55	33	32.00***	< 0.001	1.06
Recognition: Memory Test	19.67	6.68	1.00	3.87	33	10.00***	< 0.001	3.34

RPM Raven Progressive Matrices, CVS Crichton Vocabulary Scale, DSLD Test Preschool Detection of Speech and Language Disorders Test Preschool, TAAC Test for the Assessment of Attention and Concentration in Primary School
^**p < 0.01, ***p < 0.001; Hedges' g: 0.2 = small effect size, 0.5 = medium effect size, 0.8 = large effect size

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