Table 4.

Percentage of positive endorsement and chi-square results for DSM-IV TR criteria comparisons for the high-functioning ASD versus ADHD group

	High-functioning ASD		ADHD		Sensitivity	Specificity	Chi-square	Phi
	Present	Absent	Present	Absent
Social relatedness
Non-verbal behavior	33	22	9	18	60.00%	66.67%	5.15*	.25
Failure to develop peer relationships	39	16	12	15	70.90%	55.56%	5.39*	.26
Lack of seeking to share	18	37	6	21	32.73%	77.78%	0.97	.11
Lack fo social/emotional reciprocity	27	28	11	16	49.09%	59.26%	0.75	.10
Communication
Delay/lack of speech	19	36	4	23	34.55%	85.19%	3.49***	.21
Impaired conversational ability	32	23	14	13	58.18%	48.15%	0.30	.06
Stereotyped/repetitive/idiosyncratic language	27	28	5	22	49.09%	81.48%	7.90**	.31
Lack of make-believe/imaginative play	23	32	3	24	41.82%	88.89%	7.89**	.31
Restricted/repetitive/stereotyped patterns
Stereotyped/restricted pattern of interest	32	23	10	17	56.36%	62.96%	0.32	.05
Non-functional routine or ritual	35	20	8	19	63.64%	70.37%	0.37	.07
Stereotyped or repetitive motor mannerisms	33	22	7	20	60.00%	74.07%	1.57	.14
Preoccupation with parts of objects	7	48	3	24	12.73%	88.89%	0.04	.02

^**p < .01;

^*p < .05;

^***p < .07