Graduate Institute of Nursing, College of Nursing, Taipei Medical University, Taipei, Taiwan; Department of Nursing, Wan Fang Hospital, Taipei Medical University, Taipei, Taiwan.
OBJECTIVE: To examine the psychometric properties of the Chinese version of the Sleep-Associated Monitoring Index (SAMI) in Taiwanese haemodialysis patients. DESIGN: An instrument translation and validation study. SETTING: A haemodialysis (HD) unit in a university-affiliated medical centre in northern Taiwan. PARTICIPANTS: 206 patients who were 18 or above, diagnosed with end-stage renal disease and under maintenance HD twice or thrice a week, 3h or more per session for more than 3 months. METHODS: A principal component analysis was used to examine the construct validity of the SAMI. The participants were classified into poor (n=160) and good sleepers (n=46) using a cut-off value of 5 on the Pittsburgh Sleep Quality Index (PSQI). All participants filled out the Beck Depression Inventory (BDI) and Back Anxiety Inventory (BAI) along with the SAMI. Internal consistency was examined by the Cronbach's a. To assess test-retest reliability, the participants were asked to fill out the SAMI on a second occasion at a 2-week interval. RESULTS: Eight subscales emerged from the principal component analysis. Individual with insomnia had significantly higher total SAMI scores (p