Hassiotis, Angela;
Melville, Craig;
Jahoda, Andrew;
Strydom, Andre;
Cooper, Sally-Ann;
Taggart, Laurence;
Cooper, Vivien;
... Marston, Louise; + view all
(2022)
Estimation of the minimal clinically important difference on the Aberrant Behaviour Checklist-Irritability (ABC-I) for people with intellectual disabilities who display aggressive challenging behaviour: A triangulated approach.
Research in Developmental Disabilities
, 124
, Article 104202. 10.1016/j.ridd.2022.104202.
(In press).
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Abstract
BACKGROUND: The minimal clinically important difference (MCID) is relevant in the estimation of improvement in a patient outcome. AIM: To determine the MCID on the Aberrant Behaviour Checklist-Irritability (ABC-I), widely used to measure the effects of intervention for aggressive challenging behaviour in people with intellectual disabilities. METHOD AND PROCEDURES: We utilised distribution and anchor based methods to estimate the ABC-I MCID. We extracted data from 15 randomised controlled trials (RCTs) for meta-analysis. We conducted three online workshops with family carers and professionals to consider meaningful change in case vignettes of increasing severity of aggressive challenging behaviour. OUTCOMES AND RESULTS: We did not find overlap in the range of values between the two approaches. The meta-analysis indicated a range of MCID on the ABC-I (0.05, 4.94) whilst the anchor-based estimation indicated a larger change (6.6, 16.6). CONCLUSIONS AND IMPLICATIONS: The MCID is essential in interpreting the results from intervention studies. The present work was undertaken as part of a wider programme on the development and testing of a psychosocial intervention for aggressive challenging behaviour, and it is of interest to researchers in justifying how they choose and determine the MCID on the outcome of interest.
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