Table 4.

Behavioral assessments of 12-month HR-ASD group by participation timepoints. P value of t test comparing scores of each behavioral assessment between the matching and nonmatching 12-month HR-ASD infants (significant p value is emboldened). ADOS Autism Diagnostic Observation Schedule, MSEL Mullen Scales of Early Learning

	Full HR-ASD	Matching HR-ASD	Nonmatching HR-ASD	p value
Behavioral assessments (mean ± SD (n))
ADOS
24-month severity score	4.81 ± 2.5 (25)	4.21 ± 2.29 (14)	5.81 ± 2.79 (11)	0.15
36-month severity score	4.9 ± 2.19 (23)	3.85 ± 1.68 (13)	6.3 ± 2.93 (10)	0.006
12-month MSEL	n = 27	n = 14	n = 13
Composite scaled score	99.0 ± 15.0	102.9 ± 13.3	94.8 ± 16.0	0.16
Verbal developmental quotient	90.0 ± 20.5	93.1 ± 20.4	86.7 ± 21.0	0.43
Non-verbal developmental quotient	116.7 ± 13.4	121 ± 12.1	112 ± 13.7	0.08