Fig 1.
Flow-chart of the methods used for the study.
Table 1.
Baseline characteristics of patients (n = 541).
Values are expressed as mean ± standard deviation or percentages.
Fig 2.
Dendogram of the cluster analysis.
Fig 3.
Scree plot for the eigenvalues of the correlation matrix.
Fig 4.
Scores of the questionnaires for the two principal components.
Twenty-five percent, 50%, and 100% variance circles are displayed in the plot.
Table 2.
Eigenvectors for the two principal components.
Fig 5.
Relationship between principal component 1 and the Multidimensional Prognostic Index (MPI).
Regression line, 95% prediction limits, 95% probability ellipse and residuals are displayed in the plot.