Factor Structure, Internal Consistency, and Screening Sensitivity of the GARS-2 in a Developmental Disabilities Sample

Table 5

GARS-2 means and standard deviations for total sample, adjusted total sample, ASD cases, and non-ASD cases.

GARS-2 subscale/composite	Total sample	Total sample; (adjusted)	ASD cases	Non-ASD cases	ASD versus non-ASD comparisons
Stereotyped Behavior	M = 6.71; (SD = 3.58)	M = 6.80; (SD = 3.57)	M = 8.05; (SD = 3.53)	M = 4.93; (SD = 2.74)	,
Communication	M = 8.23; (SD = 3.80)	M = 8.32; (SD = 3.84)	M = 9.70; (SD = 3.48)	M = 6.26; (SD = 3.41)	,
Social Interaction	M = 6.72; (SD = 3.45)	M = 6.76; (SD = 3.46)	M = 7.94; (SD = 3.10)	M = 4.99; (SD = 3.23)	,
Autism Index	M = 82.14; (SD = 21.20)	M = 82.62; (SD = 21.33)	M = 90.81; (SD = 18.94)	M = 70.40; (SD = 18.78)	,

Note. GARS-2 subscale scores are in standard score units (normative M = 10, SD = 3) and the Autism Index is standardized according to a deviation quotient metric (normative M = 100, SD = 15).
Thirty-eight cases were removed from the non-ASD condition for this analysis, because they had not yet had an ASD evaluation to rule out the possibility of an ASD diagnosis. Without these cases, the adjusted total sample size is 202 cases and the non-ASD condition consists of 81 cases.
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