Fig. 2
A-C Biplot graphs showing the correlation between symptoms according to the three components. The length of the lines correspond to the magnitude of factor loading values. Factor loading values indicate the contribution of each variable to the component. A high value indicates that the factor strongly influences the component. The angles between the lines correspond to their correlation; a small angle denotes a higher positive correlation, a right angle denotes no likely correlation, and large diverging angles (close to 180) show a negative correlation