Longitudinal performance on the Ruff Figural Fluency Test per educational level.

Abbreviations: RFFT, Ruff Figural Fluency Test; SD, standard deviation; IQR, interquartile range.a Trends across consecutive measurements and educational levels were analyzed by ANOVA for the number of unique designs and by Kruskal-Wallis H test for the number of perseverative errors.bp value for trend across educational levels is c Trend across educational levels is not statistically significant.dp value for trend across educational levels is Longitudinal performance on the Ruff Figural Fluency Test per educational level.