METHODS: This study was carried out in two phases: the translation and cultural adaptation phase and the validation phase. The instrument was translated from English to Malay and then adapted and validated in a sample of 337 patients with CKD stages 3-4 attending a nephrology clinic in a tertiary hospital in Malaysia. Structural validity was evaluated by exploratory factor analysis. The instrument's reliability was assessed by internal consistency and test-retest reliability. The correlations between the MCKD-SM and kidney disease knowledge and the MCKD-SM and self-efficacy were hypothesised a priori and investigated.
RESULTS: The MCKD-SM instrument has 29 items grouped into three factors: 'Understanding and Managing My CKD', 'Seeking Support' and 'Adherence to Recommended Regimen'. The three factors accounted for 56.3% of the total variance. Each factor showed acceptable internal reliability, with Cronbach's α from 0.885 to 0.960. The two-week intra-rater test-retest reliability intraclass correlation coefficient values for all items ranged between 0.938 and 1.000. The MCKD-SM scores significantly correlated with kidney disease knowledge (r = 0.366, p