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Fig. 2 | Health and Quality of Life Outcomes

Fig. 2

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

Fig. 2

Bland-Altman plot for the test-retest reliability. The plot illustrates the agreement between time 1 and time 2 and identifies possible outliers. Each sample is represented on the graph by conveying the mean value of the 2 assessments (x-axis) and the difference between the 2 assessments (y-axis). The mean difference was the estimated bias, and the standard deviation (SD) of the differences measured the fluctuations around this mean (outliers being above 1.96 SDdiff). Reference lines shows mean difference between time 1 and time 2 (solid line), and 95 % limits of agreement for the mean difference (broken lines)

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