BI-SS信度及反應性結果

Psychometric property	Perceived difficulty scale	Ability scale
Test-retest reliability (n=84)
Relative reliability
ICC (95% CI)	0.78 (0.66-0.85)	0.97 (0.95-0.98)
Absolute reliability
SEM (SEM%†)	2.0 (12.9%)	0.7 (4.6%)
MDC (MDC%‡)	5.5 (35.8%)	1.9 (12.8%)
Inter-rater reliability (n=76)
Relative reliability
ICC (95% CI)	0.74 (0.62-0.83)	0.86 (0.79-0.91)
Absolute reliability
SEM (SEM%†)	1.8 (11.7%)	1.0 (6.3%)
MDC (MDC%‡)	5.1 (32.4%)	2.8 (17.4%)
Responsiveness (n=57)
Internal responsiveness
SES	0.78	1.17
SRM	0.89	1.56
Paired t	6.7*	11.8*
External responsiveness, Pearson's r
Change in BI	0.23	0.61*

*p<0.001

† SEM%=SEM/mean*100

‡ MDC%=MDC/mean*100

ICC=intraclass correlation coefficient; SEM=standard error of measurement; MDC=minimal detectable change; SES=standardized effect size; SRM=standardized response mean.

註：Perceived difficulty scale的test-retest absolute reliability>inter-rater absolute reliability，主要是因為test-retest reliability study的SDall testing scores(4.2)>inter-rater reliability study的SDall testing scores(3.6)。

另外，因為Perceived difficulty scale是個案自陳，所以不管test-retest 或是inter-rater的狀況，都是個案的回答導致其結果，跟是不是同一個rater好像沒有關係。

關於external responsiveness，Perceived difficulty scale的改變與BI的改變之相關只有0.23，也不呈現顯著。此結果意味著就算個案在生活中已由無法獨立到可獨立從事一些BADL，仍有可能對於一些task感到困難。