Psychometric assessment of the Italian version of the melanoma module (SCNS-M12-Ita) of the Supportive Care Needs Survey (SCNS-SF34).

Abstract

This study examines the validity and the reliability of the translated-into-Italian version of the SCNS-SF34 melanoma module (SCNS-M12-Ita) for a sample of patients with melanoma (n = 268). Content validity was analyzed by examining the redundancy of items. Floor/ceiling effects were investigated via frequency tables. Factor structure was studied through principal component analysis. Internal consistency was evaluated with Cronbach α. Test-retest reliability was analyzed using intraclass correlation coefficients (ICCs). Convergent-discriminant validity was studied by calculating Pearson correlations. Construct validity was investigated by comparing subgroups of patients through multivariate analysis of variance. Content validity of the SCNS-M12-Ita was satisfactory. The floor effect ranged from 24.3% to 82.5%. The 2-factor solution explained 61.4% of the total variance. Internal consistency was excellent for component 1 (α = 0.92) and questionable (α = 0.58) for component 2. Test-retest reliability was excellent for component 1 (ICC = 0.92) and poor for component 2 (ICC = 0.58). Except for component 2, item-total correlations were greater than 0.60. Construct validity was confirmed, as the expected correlations (r < 0.40) were observed and 60% of the postulated hypotheses about between-group differences were confirmed. The study demonstrated that the SCNS-M12-Ita is a valid and reliable instrument for assessing the supportive care needs of patients with melanoma.