Reliability and validity of a vertical numerical rating scale supplemented with a faces rating scale in measuring fatigue after stroke

Table 2 Relative and absolute reliabilities of a numerical rating scale supplemented with a faces rating scale

Scale	ICC (95 % CI)	SEM	MDC₉₅	Bland-Altman analysis
Scale	ICC (95 % CI)	SEM	MDC₉₅	d	SD_diff	SE of d	95 % CI of the d	LOA
NRS-FRS	0.95 (0.92–0.96)	0.50	1.39	−0.16	1.00	0.10	−0.36 to 0.04	−2.12 to 1.80

NRS-FRS numerical rating scale supplemented with faces rating scale, ICC intraclass correlation coefficient, CI confidence interval, SEM standard error of measurement = SD_pooled × √(1 − ICC)], where SD _pooled is the standard deviation for all observations from test occasions 1 and 2, MDC ₉₅ minimal detectable change at the 95 % CI level = 1.96 × √2 × SEM = 1.96 × √2 × SD_pooled × √(1 − ICC)], where 1.96 is the 2-tailed tabled z value for the 95 % CI and √2 represents the variance of 2 measures, d mean of difference between the two test sessions (test session 2 minus test session 1), SD _diff standard deviation of mean difference, SE standard error, 95 % CI of the d mean difference ± 1.96 × SE = d ± 1.96 × (SD_diff /√n), where n is the sample size, 95 % LOA 95 % limits of agreement = d ± 1.96 SD_diff

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