Table 1.

Prevalence of ADI-R Autism Symptoms, Time 1 versus Time 5

	Time 1	Time 5	Changea	tb
Repetitive Behaviors and Stereotyped Interests	3.43 (1.52)	2.48 (1.55)		1.15**
Unusual preoccupations	31%	26%	−5%
Circumscribed interests	60%	50%	−10%*
Compulsions and rituals	73%	52%	−21%**
Hand and finger mannerisms	51%	34%	−17%**
Other complex mannerisms, body movements	31%	28%	−3%
Repetitive use of objects	38%	24%	−14%**
Unusual sensory interests	59%	34%	−25%**
Non-verbal Communication Impairments	3.04 (1.21)	2.82 (1.38)		0.37**
Pointing to express interest	79%	73%	−6%
Nodding	71%	64%	−7%*
Head shaking	73%	64%	−9%*
Conventional and instrumental gestures	81%	82%	1%
Impairments in Social Reciprocity	10.40 (2.92)	9.23 (3.47)		1.56**
Direct gaze	79%	65%	−14%**
Social smiling	70%	65%	−5%
Range of facial expression to communicate	84%	67%	−17%**
Interest in people	78%	74%	−4%
Response to approaches of others	80%	61%	−19%**
Friendships	89%	80%	−9%**
Showing and directing attention	79%	75%	−4%
Offering to share	84%	83%	−1%
Seeking to share enjoyment with others	69%	65%	−4%
Use of others body to communicate	35%	32%	−3%
Offering comfort	67%	62%	−5%
Quality of social overtures	60%	61%	1%
Inappropriate facial expression	81%	64%	−17%**
Appropriateness of social responses	84%	68%	−16%**
Verbal Communication Impairments	3.82 (1.70)	2.96 (1.79)		1.10**
Social vocalization	73%	62%	−11%**
Reciprocal conversation	79%	68%	−11%**
Stereotyped utterances and delayed echolalia	73%	57%	−16%**
Inappropriate questions/statements	61%	37%	−24%**
Pronominal reversal	35%	32%	−3%
Neologisms	20%	14%	−6%
Verbal rituals	41%	27%	−14%**
Total Autism Symptoms	16.87 (4.22)	15.85 (3.98)		1.41**

^aMcNemar test,

^bPaired-samples t-test,

^*p < .05,

^**p < .01