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COMPARATIVE STUDY
JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
The active movement scale: an evaluative tool for infants with obstetrical brachial plexus palsy.
Journal of Hand Surgery 2002 May
Newborns with peripheral nerve lesions involving the upper extremity are difficult to evaluate. The reliability of the Active Movement Scale (AMS), a tool for assessing motor function in infants with obstetrical brachial plexus palsy (OBPP), was examined in 2 complementary studies. Part A was an interrater reliability study in which 63 infants younger than 1 year with OBPP were independently evaluated by 2 physical therapists using the AMS. The scores were compared for reliability and controlled for chance agreement by using kappa statistics. Overall kappa analysis of the 15 tested movements showed a moderate strength of score agreement (kappa = 0.51). Quadratic-weighted kappa (kappa(quad)) statistics showed that 8 of the 15 movements tested were in the highest strength of agreement category (kappa(quad) = 0.81-1.00). Five movements showed substantial agreement (kappa(quad) = 0.61-0.80), and 2 movements had moderate agreement (kappa(quad) = 0.41- 0.60). The overall kappa(quad) was 0.89. Part B was a variability study designed to examine the dispersion of scores when infants with OBPP were evaluated with the AMS by multiple raters. Ten pediatric physical therapists with varying degrees of experience using the scale attended a 1(1/2)-hour instructional workshop on administration of the tool for infants with OBPP. A chain-block study design was used to obtain 30 assessments of 10 infants by 10 raters. A 2-way analysis of variance indicated that the variability of scores due to rater factors was low compared with the variability due to patient factors and that variation in scores due to rater experience was minimal. The results of part A indicate that the AMS is a reliable tool for the assessment of infants with OBPP when raters familiar with the scale are compared. The results of part B suggest that, with minimal training, raters with a range of experience using the AMS are able to reliably evaluate infants with upper-extremity paralysis.
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