Objective: The aim of this study was to adapt and validate an instrument for assessing quality of care from the patients' perspective in the context of Chilean primary care.
Methods: The 'Health Centre Assessment Questionnaire' is made up of six multiple-item scales and two single-item scales addressing eight key areas of primary care activity. A further two single-item scales ask about the overall satisfaction and the way in which the centre deals with patients' health issues. The adaptation process was developed according to methods described in the specialized literature. The instrument was initially pre-tested in a sample of 100 primary care patients. The validation was carried out in 10 urban public primary healthcare centres where 2896 patients were invited to complete the questionnaire. The validity and reliability of the instrument was assessed using standard psychometric techniques.
Results: Ninety nine per cent (2870) of those approached completed the questionnaire. It was acceptable to most of the patients as reflected by the high response rate, and a full range of possible scores in most of the scales. Reliability was good as reflected by high internal consistency and homogeneity. Validity was supported by the confirmation of scaling assumptions, the moderate correlations between multiple-item scales, and by the confirmation of our 'a priori' hypothesis.
Conclusions: The questionnaire could be a useful instrument for assessing a number of important dimensions in Chilean primary care. It is acceptable, reliable and valid. Further work is required to evaluate its validity against external criteria and its test-retest reliability.