Table 4.

Sample size-weighted MCID estimates for the Adaptive Behavior Composite score and each domain standard score, stratified by age and IQ.

		Sample Size-Weighted Anchor-based MCID estimates		Sample Size-Weighted Distribution-Based MCID estimates
Adaptive Behavior Composite		IQ < 70	IQ ≥70	IQ <70	IQ ≥70
Children (0–13)		2.5	2.9	2.0	2.7
Adolescents (13–18)		2.4	n/a*	2.5	2.8
Adults (18+)		2.8	3.8	3.0	3.4
Communication Domain
Children (0–13)		2.0	3.1	2.7	3.2
Adolescents (13–18)		3.2	n/a*	2.8	3.3
Adults (18+)		3.1	3.3	3.8	5.4
Socialization Domain
Children (0–13)		2.6	3.1	2.9	3.7
Adolescents (13–18)		2.9	5.5	3.2	4.0
Adults (18+)		3.0	5.5	4.8	4.8
Daily Living Skills Domain
Children (0–13)		2.6	3.7	2.9	3.6
Adolescents (13–18)		1.7	n/a*	3.5	4.1
Adults (18+)		3.0	5.1	3.3	3.3

^*Among studies including adolescents with IQ≥70, anchors met the inclusion criterion of a correlation above .3 only with Socialization standard scores (see Methods for further details on the correlation criterion). Consequently, anchor-based MCIDs for Daily Living Skills, Communication, and the Adaptive Behavior composite are not available (n/a) for this stratum.