Table 5.
Single-year sensitivity analysis: between-class ICC and key coefficients by survey year (each student contributes at most one record).
| Year | ICC null | ICC adj | BMI (w/in) | Sex | Prop male | Mean BMI |
|---|---|---|---|---|---|---|
| 2020 | 0.097 | 0.093 | −0.455*** | −0.448*** | −0.890 | −0.451* |
| 2021 | 0.132 | 0.084 | −0.526*** | −4.771*** | 0.096 | −0.553*** |
| 2022 | 0.253 | 0.168 | −0.538*** | −9.003*** | 2.718*** | −1.718*** |
| 2023 | 0.129 | 0.092 | −0.644*** | −4.332*** | 2.027*** | −1.726*** |
| 2024 | 0.117 | 0.080 | −0.461*** | −1.348*** | 0.732 | −0.291* |
*p < 0.05; ***p < 0.001. “Prop male” and “Mean BMI” are class-level (level-2) coefficients; “BMI (w/in)” is the within-class individual coefficient.