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

<p>Abbreviations: RFFT, Ruff Figural Fluency Test; SD, standard deviation; IQR, interquartile range.</p><p>^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.</p><p>^b<i>p</i> value for trend across educational levels is <0.001.</p><p>^c Trend across educational levels is not statistically significant.</p><p>^d<i>p</i> value for trend across educational levels is <0.01.</p><p>Longitudinal performance on the Ruff Figural Fluency Test per educational level.