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KINDL-R subscale and total mean z-scores according to age- and gender-specific reference values in the subgroups of children with mild neurodevelopmental difficulties (A), current weekly symptoms, current medication, and surgical treatment (B). P-CHI, persistent CHI; T-CHI, transient CHI; areference values of BELLA study of the KiGGS (9); breference values of KiGGS study (8).
