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Reliability and validity of the Severe Impairment Battery, short form (SIB-s), in patients with dementia in Spain

I. Cruz-Orduña, L.F. Agüera-Ortiz, I. Montorio-Cerrato, B. León-Salas, M.C. Valle de Juan, P. Martínez-Martín [REV NEUROL 2015;60:1-9] PMID: 25522858 DOI: https://doi.org/10.33588/rn.6001.2014166

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Volumen 60 | Number 01 | Nº of views of the article 9.398 | Nº of PDF downloads 1.012 | Article publication date 01/01/2015

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ABSTRACT

INTRODUCTION People with progressive dementia evolve into a state where traditional neuropsychological tests are not effective. Severe Impairment Battery (SIB) and short form (SIB-s) were developed for evaluating the cognitive status in patients with severe dementia.

AIM To evaluate the psychometric attributes of the SIB-s in patients with severe dementia.

PATIENTS AND METHODS 127 institutionalized patients (female: 86.6%; mean age: 82.6 ± 7.5 years-old) with dementia were assessed with the SIB-s, the Global Deterioration Scale (GDS), Mini-Mental State Examination (MMSE), Severe Mini-Mental State Examination (sMMSE), Barthel Index and FAST.

RESULTS SIB-s acceptability, reliability, validity and precision were analyzed. The mean total score for scale was 19.1 ± 15.34 (range: 0-48). Floor effect was 18.1%, only marginally higher than the desirable 15%. Factor analysis identified a single factor explaining 68% of the total variance of the scale. Cronbach’s alpha coefficient was 0.96 and the item-total corrected correlation ranged from 0.27 to 0.83. The item homogeneity value was 0.43. Test-retest and inter-rater reliability for the total score was satisfactory (ICC: 0.96 and 0.95, respectively). The SIB-s showed moderate correlation with functional dependency scales (Barthel Index: 0.48, FAST: –0.74). Standard error of measurement was 3.07 for the total score.

CONCLUSIONS The SIB-s is a reliable and valid instrument for evaluating patients with severe dementia in the Spanish population of relatively brief instruments. KeywordsAlzheimer’s disease Neuropsychological test Reliability Severe cognitive impairment Severe dementia Severe Impairment Battery-short version (SIB-s)Validity CategoriesDemencia Neurodegeneración Neuropsicología Neuropsiquiatría

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Original

Reliability and validity of the Severe Impairment Battery, short form (SIB-s), in patients with dementia in Spain