Relationship between mean anxiety and depression scores and 'mood' color (positive, neutral or negative) in healthy, anxious and depressed volunteers in Permutations 4-8. Healthy subjects are shown in blue, anxious in orange and depressed in red. The appropriately colored dots indicate each individual's HAD anxiety (top row of figures) or depression (bottom row of figures) score and the lines of a similar color show each groups mean score. The rho values written in black, represent the overall magnitude of the relationships of the three groups namely, healthy, anxious and depressed whereas the rhos written in red, orange and blue represent the individual groups. Optimal permutations were identified by those which best discriminated between the various subgroups and which displayed a greater strength of relationship between the degree of anxiety/depression and positive/negative colors for example, Permutation 7 & 8 were most marked in HAD depression in healthy volunteers (p = 0.008) and Permutation 4 was most marked for HAD anxiety in the anxious group (p = 0.001). Data was analysed using Spearman's correlation.