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Cross-cultural adaptation and psychometric validation of a Spanish version of the Quality of Life in Late-Stage Dementia Scale

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Abstract

Purpose

The aim of the study was to develop a cross-cultural adaptation and to evaluate the validity and reliability of a Spanish version of the Quality of Life in Late-Stage Dementia (QUALID) scale.

Methods

Observational and cross-sectional validation study. The QUALID was translated according to standardised procedures. Internal consistency was assessed using Cronbach’s alpha. The QUALID structure was assessed using a Principal Component Analysis (PCA). Inter-respondent (one rater asking two respondents) and inter-rater (two raters asking one respondent) reliability was assessed using the Intraclass Correlation Coefficient (ICC). The criterion validity (concurrent) was assessed by Spearman’s correlation between the QUALID score and the QoL-Visual Analogue Scale (QoL-VAS) score. The construct validity (convergent) was assessed by Spearman’s correlations between QUALID score and scores on the Pain-Visual Analogue Scale (Pain-VAS), on the Mini-Mental State Examination (MMSE) and on the Neuropsychiatric Inventory-Nursing Home (NPI-NH).

Results

A total of 160 elderly residents and 152 respondents at 8 long-term care centres in the province of Girona (Spain) participated in the study. Results showed satisfactory levels of internal consistency (Cronbach’s α coefficients 0.74) and evidenced the multidimensionality of the scale. Three factors were identified (behavioural signs of discomfort, behavioural signs of social interaction and signs of negative affective mood). Acceptable inter-respondent reliability (ICC = 0.74) and high inter-rater reliability (ICC = 0.95) were found. The QUALID score was associated with the QoL-VAS score, suggesting a good concurrent criterion validity, and also with the Pain-VAS, the MMSE and the NPI-NH scores, suggesting good construct validity.

Conclusions

Our evaluation of the psychometric properties of the Spanish version of the QUALID indicates that it is a reliable and valid instrument with an adequate capacity to distinguish between different clinical status.

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Abbreviations

QUALID:

Quality of Life in Late-Stage Dementia Scale

NPI-NH:

Neuropsychiatric inventory-nursing home

MMSE:

Mini-mental state examination

GDS:

Global Deterioration Scale

QoL-VAS:

Quality of Life-Visual Analogue Scale (0–100 points)

Pain-VAS:

Pain-Visual Analogue Scale (0–100 points)

PCA:

Principal component analysis

ICC:

Intraclass correlation coefficient

QoL:

Quality of life

CI:

Confidence interval

SD:

Standard deviation

DF:

Degrees of freedom

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Acknowledgments

This study was funded by a research grant of the Fundació La Marató de TV3 (ref. number: 063110)

Author information

Authors and Affiliations

  1. Research Unit, Institut d’Assistència Sanitària, C/Dr Castany s/n, 17190, Salt, Girona, Spain

    Josep Garre-Olmo

  2. Research Unit, Institut d’Assistència Sanitària, Girona, Spain

    Xènia Planas-Pujol, Secundino López-Pousa & Joan Vilalta-Franch

  3. Department of Psychology, University of Girona, Girona, Spain

    Josep Garre-Olmo

  4. Memory and Dementia Assessment Unit, Institut d’Asisstència Sanitària, Girona, Spain

    Secundino López-Pousa, Antoni Turon-Estrada & Joan Vilalta-Franch

  5. Department of Psychiatry, University of Texas Southwestern Medical Center, Dallas, TX, USA

    Myron F. Weiner

  6. Department of Nursing, Research Group on Health and Sanitary Attention, University of Girona, Girona, Spain

    Dolors Juvinyà & David Ballester

Authors
  1. Josep Garre-Olmo
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  2. Xènia Planas-Pujol
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  8. Joan Vilalta-Franch
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Correspondence to Josep Garre-Olmo.

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Garre-Olmo, J., Planas-Pujol, X., López-Pousa, S. et al. Cross-cultural adaptation and psychometric validation of a Spanish version of the Quality of Life in Late-Stage Dementia Scale. Qual Life Res 19, 445–453 (2010). https://doi.org/10.1007/s11136-010-9594-8

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