Characterizing Childhood Irritability Across Ages and Stages
Briefly

The occasional meltdown is a common experience in childhood, reflecting differences in the trait of irritability. High levels of irritability can be an early predictor of later mental illness.
Researchers developed age-specific versions of the MAPS-TL to assess irritability across ages 12 months to 17 years, distinguishing expected behaviors from clinical concerns.
Read at National Institute of Mental Health (NIMH)
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