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Italian translation and psychometric validation of the Manual Ability Measure-36 (MAM-36) and its correlation with an objective measure of upper limb function in patients with multiple sclerosis

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Abstract

Background

Multiple sclerosis (MS) is a chronic autoimmune disease of the central nervous system with an unpredictable course. During its course, deficits affecting upper limb functions may occur. Hence, there is a need for self-administered scales providing a comprehensive assessment of upper limb functions. The Manual Ability Measure-36 (MAM-36), which investigates patients’ performance in activities of daily living requiring upper limb function, has not been adapted and validated in the Italian context.

Objectives

We develop an Italian translation and validation of the MAM-36 in a population of people with MS (PwMS), explore its psychometric properties and investigate its associations with clinical data and the Nine Hole Peg Test (9-HPT).

Research plan and methods

The multicentre study involved five Italian neurological centres. Subjects were evaluated using EDSS, 9-HPT and the MAM-36 scale. We used confirmatory factor analysis and Rasch analysis to investigate the properties of the MAM-36.

Results

We enrolled 218 PwMS. Results supported the unidimensionality of the MAM-36, and adequate functioning of rating scale and items. Additionally, the MAM-36 showed weak negative associations with age and disease duration, and moderate associations with EDSS and 9-HPT scores.

Discussion

The adapted MAM-36 showed adequate psychometric properties. However, indications of problematic targeting to PwMS with low disability emerged. For this reason, use of the scale appears to be more suitable among patients with moderate-to-severe disability.

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Notes

  1. Prior to conducting these analyses, we investigated the presence of non-independence among MAM-36 scores due to patients’ clustering into different centres. We computed the intraclass correlation coefficient (ICC) for MAM-36 scores via linear mixed model, controlling for demographic (age, gender) and clinical (disease course, disease duration, and clinician-rated EDSS) variables, i.e. we computed the residual ICC [22]. Based on our computation, the residual ICC for MAM-36 scores was 0.012, corresponding to a design effect of 1.61, which compared with the suggested cut-off (a design effect ≥ 2, [23]), indicated no significant clustering effect was present beyond that due to demographic and clinical variables. For this reason, we did not control for the effect of centres in subsequent analyses.

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Funding

This work was partly supported by a Grant 2014/R20 from the Italian Multiple Sclerosis Foundation (FISM).

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Authors

Contributions

CS conceived the study and designed the study protocol. CS, DM, DC, RDG, EG, BG, MM, AT, RB, FP, AP, LP, LC and RR recruited the subjects and carried out the experiments. DM, DC and RR analysed the results. CS, DM, DC, RDG and EG wrote the manuscript. All authors have read and approved the final version of the manuscript.

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Correspondence to Davide Marengo.

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Solaro, C., Di Giovanni, R., Grange, E. et al. Italian translation and psychometric validation of the Manual Ability Measure-36 (MAM-36) and its correlation with an objective measure of upper limb function in patients with multiple sclerosis. Neurol Sci 41, 1539–1546 (2020). https://doi.org/10.1007/s10072-020-04263-2

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