Table II.

Subject tracking information

Diagnostic group	No.	Mean no. of visits (SD)	Most recent diagnostic age (mo; SD)	% Sample tracked until 24 mo or greater	% Sample tracked until 32 mo or greater
ASD	32	6.0 (2.5)	34.7 (8.8)	97	72
Prior positive ASD test result*	5	4.8 (2.2)	32.0 (8.9)	80	60
LD	56	4.4 (2.4)	25.9 (9.2)	54	30
DD	9	5.8 (2.9)	33.4 (9.8)	78	67
Other	36	4.3 (2.1)	25.7 (8.6)	61	26
False-positive	46	4.6 (2.3)	25.4 (8.7)	61	28
Typical	41	4.3 (2.7)	25.5 (10.3)	56	42

^*Indicates a failure on the ADOS-T, as well as a clear clinical judgment of ASD during early testing phases. At follow-up visits, these five toddlers no longer met ADOS-T or clinical judgment for ASD. Also note that there were also a small percentage of infants who met criteria for ASD on the ADOS-T but were not considered at-risk for an ASD because of clinical judgment. Children with profound mental retardation or those with scores only in the mild range of concern, for example, have a high false-positive rate on the ADOS-T.¹⁴