The psychometric properties of the Chinese Dialysis Quality of Life Scale for Hong Kong dialysis patients

AIMS: This paper describes the process by which the Chinese Dialysis Quality of Life Scale was developed, and the preliminary testing and psychometric evaluation of the scale in a sample of dialysis patients. BACKGROUND: Quality of life as a specific outcome variable has not been systematically and satisfactorily studied in Chinese dialysis patients in Hong Kong. A single global quality of life measure that is both reliable and valid for dialysis patients has yet to be developed. Without measurement tools, it is impossible to judge progress towards this goal. DESIGN: A list of key issues was first derived from an in-depth literature review, then verified by semi-structured interview on seven patients. The initial list of 87 items was then further refined through two rounds of content analysis. The remaining 50 items were finalized by pilot test on seven patients. Of the refined 40 items, face validity was assessed by a team including one professor and ten patients. The 40-item scale was further evaluated by stability, internal consistency and criterion validity with a convenience sample of 164 patients. The scale demonstrated high internal consistency and good test-retest reliability and criterion validity when used. CONCLUSIONS: The psychometric evaluations suggest that the instrument is worthy of further development. Continued validation of this scale on larger sample and Chinese population living outside Hong Kong has the potential to provide nurses with a valid assessment and treatment guide, and researchers with a valid measurement tool.