Links between looking and speaking in autism and first-degree relatives: insights into the expression of genetic liability to autism

Table 1 Sample Characteristics

	Control Group	ASD Group			Group Comparisons
	(n = 45; 23/22 M/F)	(n = 51; 42/9 M/F)			Group Comparisons
	M (SD)	M (SD)			t	df	p
Age (years)	18.9 (5.8)	17.8 (8.5)			0.76	94	0.45
Full IQ	117.62 (12.37)	105.86 (12.77)			4.57	94	< 0.001
Performance IQ	113.76 (14.5)	104.90 (14.5)			2.97	94	0.004
Verbal IQ	118.82 (11.7)	105.82 (14.18)			4.86	94	< 0.001
Narrative ability (LSA)	0.50 (0.09)	0.40 (0.11)			3.96	60	< 0.001
ADOS^b
Social Affect Severity Score	–	6.4 (2.1)			–
RRB Severity Score	–	7.0 (2.5)			–
Total Severity Score	–	6.7 (2.3)			–
ADI-R
IS factor sum	–	0.93 (0.63)			–
RSM factor sum	–	0.54 (0.44)			–
	Parent-control Group	Parent-ASD Group			Group Comparisons between Parent-control and Parent-ASD Groups Overall
	(n = 58; 22/36 M/F)	(n = 133; 50/83 M/F) (n = 62 BAP+; n = 66 BAP-)
	M (SD)	M (SD)			t	df	p
	M (SD)	Overall	BAP(+)	BAP(−)	t	df	p
Age (years)	41.2 (10.4)	46.2 (8)	47.0 (7)	45.3 (8.5)	−3.26	88^a	0.002
Full IQ	114.4 (11.7)	111.9 (11.32)	112.5 (11.3)	111.4 (11.2)	1.38	189	0.17
Performance IQ	114.6 (13.1)	110.6 (11.54)	110.9 (11.2)	110.6 (11.7)	2.12	189	0.04
Verbal IQ	110.7 (12.9)	110.5 (11.61)	111.3 (12.5)	109.6 (10.8)	0.07	189	0.95
Narrative ability (LSA)	0.50 (0.09)	0.46 (0.11)	0.46 (0.12)	0.46 (0.10)	2.62	132^a	0.01

IS Insistence on Sameness, IQ Intelligence Quotient, LSA Latent Semantic Analysis, RRB Restricted and Repetitive Behavior, RSM repetitive sensorimotor.
^aEqual variance not assumed in statistical t-test
^bComparison severity score labels are as follows: 0–2 = “minimal-to-no evidence”, 3–4 = “low”, 5–7 = “moderate”, 8–10 = “high”

ISSN: 2040-2392