Figure 1From: Psychometric study of the Persian short-form eight-item Parkinson’s disease questionnaire (PDQ-8) to evaluate health related quality of life (HRQoL) Bland-Altman plot of the scores from independent and nested PDQ-8 showing the mean difference of -0.026 (solid line) and the 95% limits of agreement of -2.742 to +2.689 (dotted lines) for the difference between the two scores. Back to article page