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Age of onset per group. The graph shows the distribution and the mean (horizontal line) age of onset for each of the five defined groups. Groups 1, 2, and 4 patients had a significantly later age of onset than group 3 patients (t = 2.35 p = 0.024; t = 2.15 p = 0.04; t = 2.01 p = 0.05, respectively).
