Fig. 4.

Results of the mixed-effects model analysis for seven symptom groups derived from the PCC-specific questionnaire. The mean regression coefficients (slopes) with a 95% confidence interval are plotted to visualize the difference in the change in symptom scores between CoQ10 and placebo. A negative slope indicates a larger reduction in the symptom score with CoQ10 compared to placebo; the dotted vertical line at 0.0 indicates no difference between CoQ10 and placebo. None of the estimated difference in the symptom groups reached statistical significance.