[Validation of the Spanish version of the Modified Stanford Health Assessment Questionnaire (MSHAQ), an instrument to measure people's satisfaction at their ability to perform normal day-to-day activities].

OBJECTIVES: To design a Spanish version of the Modified Stanford Health Assessment Questionnaire (MSHAQ), and to evaluate its reliability, internal consistency and validity of construction.
DESIGN: Adaptation using the translation and back-translation method, which focused on ensuring the conceptual equivalence of each item. For the validation study, a cross-sectional study was conducted.Participants. 52 people over 65 being monitored for a chronic clinical condition. MAIN MEASUREMENTS: As well as anamnesis and the Barthel index, subjects were asked to answer the Spanish version of the MSHAQ on the day of their visit and three days afterwards to evaluate test-retest reliability.
RESULTS: A sample of 52 people, 23 men and 29 women, with a mean age of 74.2 (SD, 5.8) was examined. Study of test-retest reliability showed an intra-class correlation coefficient (ICC) of 0.89, 0.82, 0.88 and 0.51 for Tables A (capacity), B (satisfaction), C (need for help), and D (change in the last 6 months) of the MSHAQ. These four sub-scales were internally consistent, with Crombach's alpha of 0.83, 0.76, 0.61, and 0.82, respectively. There was a statistically significant correlation between all the tables in the questionnaire and between these and Barthel's index.
CONCLUSIONS: It can be concluded that the Spanish version of the MSHAQ is a valid and reliable measuring instrument, which enables studies performed in various countries to be compared.