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Temper tantrum score means and distributions by parent-reported expressive vocabulary for (a) toddlers age 12–23 months and (b) toddlers age 24–38 months. Higher scores indicate more severe/frequent tantrums. These “violin” plots show width of the distribution as density of observations at that point, and a diamond indicates the mean. Note: One child in the 24–38-month-old group had 0 words; the diamond indicates that value.
