The Autism - Tics, AD/HD and other Comorbidities inventory (A-TAC): further validation of a telephone interview for epidemiological research

Table 4 Sensitivity and Specificity

Diagnostic Category	A-TAC Scale	Cut Off	Sensitivity/Specificity: Clinical sample and Control group	Sensitivity/Specificity: Clinical, Community samples and Control group
Autism spectrum disorder	Gate items	4.5	0.96/0.88	0.91/0.80
		8.5	0.71/0.95	0.61/0.91
AD/HD	Gate items	6.0	0.98/0.81	0.91/0.73
		12.5	0.52/0.95	0.56/0.93
Motor coordination	Gate items	0.5	0.59/0.85	0.63/0.68
		1	0.28/0.95	0.32/0.87
Perception	Gate items	0.5	0.91/0.62	0.92/0.46
		2.5	0.62/0.93	0.55/0.83
Learning*	Gate items	1.0	0.88/0.75	0.92/0.60
		3.0	0.23/0.96	0.41/0.93
Planning & organizing tasks	Gate items	1.0	0.91/0.80	0.82/0.70
		1.5	0.64/0.91	0.54/0.85
Tics	Gate items	1.5	0.92/0.90	0.875/0.86

*) cut-off values determined by the large group
The highest cut off level yielding a sensitivity ≥ 0.90 (≥ 0.95 for ASD and AD/HD) and the lowest yielding a specificity ≥ 0.90 (≥ 0.95 for ASD and AD/HD), with the actual sensitivity and specificity first in the clinical and control groups, then in the larger group including both index groups.

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