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Vol. 153. Issue 3.
Pages 106-111 (August 2019)
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Vol. 153. Issue 3.
Pages 106-111 (August 2019)
Brief report
Evaluation of pain intensity in people with rheumatoid arthritis using the MOS intensity scale
Evaluación de la intensidad del dolor en personas con artritis reumatoide mediante la escala de intensidad MOS
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Gabriel Horta-Baasa,
Corresponding author
gabho@hotmail.com

Corresponding author.
, María del Socorro Romero-Figueroab,c
a Servicio de Reumatología, Hospital General Regional 220, Delegación Estado de México Poniente, Instituto Mexicano del Seguro Social, Toluca, Mexico
b División de Evaluación de la Investigación, Instituto Mexicano del Seguro Social, Mexico City, Mexico
c Centro de Investigación en Ciencias de la Salud, Campus Norte Huixquilucan, Universidad Anáhuac México, Mexico City, Mexico
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Figures (2)
Tables (3)
Table 1. General characteristics of the subjects studied.
Table 2. Evaluation of the pain intensity scale internal consistency.
Table 3. Construct validity (convergent/divergent): correlation between the pain intensity score obtained with the MOS questionnaire and the variables of interest.
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Abstract
Introduction and objective

Patients with rheumatoid arthritis (RA) consider pain to be their main problem. The goal of this study was to evaluate validity and sensitivity to change to measure pain intensity using the MOS scale in RA patients.

Patients and methods

Three hundred sixty-three RA subjects were included. Internal consistency of the instrument was assessed with Chronbach's alpha, construct validity was estimated with confirmatory factor analysis and hypothesis testing and sensitivity to change was evaluated with the standard response mean and hypothesis testing.

Results

The MOS scale showed an appropriate internal consistency (α=0.89) and confirmatory factor analysis revealed it to be a unidimensional scale. In addition, the MOS scale was strongly correlated (rho=0.86) with the visual analogue scale. Convergent validity was demonstrated with the acceptance of 83% of hypotheses a priori. MOS scale standard response mean was 0.33 and 0.21 for the visual analogue scale, pain intensity changes in scales were strongly correlated, supporting its sensitivity to change.

Conclusion

MOS scale is a useful instrument to measure pain intensity as well as pain relief.

Keywords:
Patient reported outcome measures
Validation studies
Pain measurement
Arthritis
Resumen
Introducción y objetivo

Las personas con artritis reumatoide (AR) consideran el dolor como su principal problema. El objetivo del estudio fue evaluar la validez y sensibilidad al cambio de la escala de intensidad del dolor MOS en personas con AR.

Pacientes y métodos

Se incluyeron 363 pacientes con AR. La consistencia interna fue valorada con el alfa de Cronbach, la validez de constructo se evaluó mediante el análisis factorial confirmatorio y con pruebas de hipótesis, la sensibilidad al cambio se evaluó mediante la respuesta media estandarizada y con prueba de hipótesis.

Resultados

La escala presentó una consistencia interna apropiada (α=0,89). El análisis factorial confirmatorio demostró que la escala es unidimensional. La escala MOS presentó una fuerte correlación (rho=0,86) con la escala visual analógica. La validez convergente se demostró al aceptar el 83% de las hipótesis realizadas a priori. La respuesta media estandarizada para la escala MOS fue de 0,33 y de 0,21 para la escala visual analógica, el cambio de la intensidad del dolor de las escalas se correlacionaron fuertemente lo cual apoya su sensibilidad al cambio.

Conclusión

La escala de intensidad del dolor MOS es un instrumento válido para medir la intensidad del dolor y el alivio del dolor.

Palabras clave:
Medición de resultados informados por el paciente
Estudio de validación
Dimensión del dolor
Artritis

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