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. 2015 Oct 20;78(6):34–39. doi: 10.5935/1808-8694.20120030

Figure 2.

Figure 2

Graphical representation as proposed by Bland and Altman – reproducibility. Scores from the first and second visit. On the Y axis, the difference between the scores from the first and second administrations of the questionnaire and, on the X axis, their mean values. The central red line indicates the difference between the scores from the first and second administrations of the questionnaire and the peripheral red lines indicate the mean ± two standard deviations (1.96 × SD). SD: Standard Deviation.