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Longitudinal changes in Korean attention deficit hyperactivity disorder rating scale (K-ARS; A) and Korean version of the obstructive sleep apnea-18 (KOSA-18; B) scores in different age groups: group 1, age<7 years; group 2, ≥7, <10 years; and group 3, age≥10 years. *P<0.05, statistically significant differences among groups.
