Figure 9.

Stacked scatter plots for rate of progression for patient category and electroretinography group. Blue circles represent the progression rate for patients in the corresponding category or group and are displaced horizontally to aid visualization. Yellow diamonds represent the mean value. Asterisks mark statistically significant differences (P < .05). (A) Rate of progression for each group of patients: the rate of progression was highest for adults with childhood-onset disease, followed by children with childhood-onset disease. In all 3 categories the rate was highly variable. (B) Rate of progression for each electroretinography group: the rate of progression was statistically significantly higher for group 3. In all 3 groups the rate was again highly variable.