Finally, the null hypothesis associated with the 'Heterogeneity of regression coefficients' item is the same as the original test described above.
Table 2 provides frequency of positive answers, item variance, IRC, Loevinger H coefficients, item test retest reliability and items weight for each subindex (material, social and health deprivation).
All items were positively correlated to the total score, with coefficients item-total (Table 1) ranging from 0.29 ('loss of libido' among girls) to 0.61 ('worthlessness' among girls).
Schwartz et al 11 presented means and SDs, internal consistency (Cronbach α), test retest stability coefficients, item-scale intercorrelation and interscale correlations, and finally performed a factor analysis (scree test) to evaluate the factor structure of the SRI items.
Internal reliability was tested through Cronbach's alpha coefficient, item-total and inter-item correlations.
Item-rest = correlation coefficient item-rest (r between each item and the remaining items belonging to the same factor).
The psychometric properties evaluated for the scale referred to internal consistency (ceiling and floor effects, Cronbach's Alpha coefficient, Items Correlation Matrix, and corrected Item-Total Correlation) and the discriminant validity (t-test).
To address the first objective of this study, that is, to investigate the psychometric properties of the MSF instruments, we conducted principal components analysis, reliability coefficient, item-total scale correlation, and interscale correlation analyses [ 13, 17].
DS14 = Original 14-items Type D Scale; DS16-T = Added 2 new items in DS14 in Taiwan; DS14-T = final 14-item Taiwan version DS14; α = Cronbach's alpha coefficient; items with the item-total correlation smaller than.30 and an increase in Cronbach's alpha when deleted are in boldface.
The coefficients for Item 17 (satisfaction with concentration), r = 0.50 and item 25 (concentration problems when tinnitus is severe), r = 0.57 are moderately high.
Abbreviations: GFI Groningen Frailty Indicator, Hi scaling coefficient of item, Hs scaling coefficient of total subscale, CI confidence interval.
