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  • Research indicates substantial inter-rater and test–retest reliability for individual items, excellent inter-rater reliability within domains and excellent internal consistency [internal consistency (Cronbach’s α values) for Modules 1 through 3 were high for the social affect domain (SA) (0.87–0.92) and moderate for the repetitive restricted behavior domain (RRB) (0.51–0.66); test–retest reliability for Modules 1 through 3: SA, RRB, and overall total scores had correlations ranging from 0.68 to 0.92; Inter-rater reliability for SA, RRB, and overall total ranged from 0.79 to 0.98 across the five modules] [44].
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