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Prospective Study
©The Author(s) 2025.
World J Psychiatry. Dec 19, 2025; 15(12): 111663
Published online Dec 19, 2025. doi: 10.5498/wjp.v15.i12.111663
Table 2 Multilevel models predicting academic performance over time, β (SE)
Parameter
Model 1 unconditional
Model 2 main effects
Model 3 full model
Fixed effects
    Intercept2.14 (0.07)a3.82 (0.24)a3.96 (0.28)a
        Time (6-month intervals)0.08 (0.03)b0.06 (0.03)c0.05 (0.03)
        Parental anxiety (PSI-4)--0.42 (0.08)a-0.38 (0.09)a
        Time × parental anxiety--0.04 (0.02)c-0.03 (0.02)
    Child age--0.08 (0.04)c
    Child sex (female)--0.22 (0.10)c
    ADHD severity---0.28 (0.07)a
    Medication use--0.18 (0.11)
    Family income--0.12 (0.05)c
    Comorbid anxiety---0.16 (0.11)
    Comorbid ODD---0.24 (0.10)c
Random effects
    Level 2 (between-person)
        Intercept variance0.48 (0.08)a0.36 (0.07)a0.28 (0.06)a
        Slope variance0.24 (0.06)a0.22 (0.06)a0.21 (0.05)a
    Level 1 (within-person)
        Residual variance0.32 (0.04)a0.28 (0.03)a0.26 (0.03)a
Model fit
    AIC1426.81398.21376.4
    BIC1445.31428.61436.8


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