Ml. Wehmeyer, INTRAINDIVIDUAL FACTORS INFLUENCING EFFICACY OF INTERVENTIONS FOR STEREOTYPED BEHAVIORS - A METAANALYSIS, JIDR. Journal of intellectual disability research, 39, 1995, pp. 205-214
The efficacy of treatments targeting stereotyped behaviours has been t
he focal point of several reviews. This study examined efficacy as a f
unction of intra-individual characteristics, including age, gender, le
vel of disability and topography of the behaviour. A meta-analysis of
studies reporting treatments of stereotyped behaviours appearing in 23
journals over 20 years was conducted. Efficacy was determined using t
wo metrics, Percentage Non-overlapping Data and Percentage Zero Data,
which indicate treatment success as a function of the degree to which
the behaviour fell below baseline levels, and once reaching zero, rema
ined there. Non-parametric analyses indicated differences in treatment
efficacy according to age and the form of the stereotypy. Implication
s for the design of treatments to address stereotypies are discussed.