Table 3.
Hierarchic regression models by age group
| Physical activity | Team participation | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Grades 4 and 5 | Grades 7 and 8 | Grades 4 and 5 | Grades 7 and 8 | |||||||||
| β | Radj2 | Δ Radj2 | β | Radj2 | Δ Radj2 | β | Radj2 | Δ Radj2 | β | Radj2 | Δ Radj2 | |
| Baseline model | — | 0.011 | — | — | 0.064 | — | — | 0.099 | — | — | 0.128 | — |
| Gender | (p=0.0255) | — | — | (p=0.4069) | — | — | (p=0.0444) | — | (p=0.9529) | — | — | |
| Race/ethnicity | (p=0.3229) | — | — | (p=0.0009) | — | — | (p<0.0001) | — | (p<0.0001) | — | — | |
| BMI | (p=0.8070) | — | — | (p=0.6287) | — | — | (p=0.9753) | — | (p=0.2144) | |||
| Model A (AIQ total score) | — | 0.237 | 0.226 | — | 0.116 | 0.052 | 0.116 | 0.052 | 0.282 | 0.154 | ||
| Athletic identity | 0.486 (p<0.0001) | — | — | 0.247 (p<0.0001) | — | — | 0.247 (p<0.0001) | — | 0.407 (p<0.0001) | — | ||
| Model B (AIQ subscales) | — | 0.242 | 0.231 | — | 0.126 | 0.062 | 0.155 | 0.056 | 0.307 | 0.179 | ||
| Appearance | 0.046 (p=0.4302) | — | — | 0.025 (p=0.6390) | — | — | 0.053 (p=0.3806) | — | 0.170 (p=0.0002) | — | — | |
| Competence | 0.194 (p=0.0017) | — | — | 0.081 (p=0.1777) | — | — | 0.130 (p=0.0448) | — | 0.153 (p=0.0044) | — | — | |
| Importance | 0.114 (p=0.0825) | — | — | 0.172 (p=0.0064) | — | — | 0.067 (p=0.3294) | — | 0.161 (p=0.0039) | — | — | |
| Encouragement from parents | 0.137 (p=0.0347) | — | — | −0.042 (p=0.3779) | — | — | 0.056 (p=0.4107) | — | 0.034 (p=42110.) | — | — | |
| Encouragement from friends | 0.083 (p=0.1806) | — | — | 0.062 (p=0.2128) | — | — | 0.062 (p=0.3426) | — | 0.032 (p=0.4609) | — | — | |
| Encouragement from teachers | 0.098 (p=0.1010) | — | — | 0.029 (p=0.5418) | — | — | 0.000 (p=0.9953) | — | 0.035 (p=0.4077) | — | — | |
Note: The baseline model included the following covariates: gender, race/ethnicity, and BMI. There were no significant interaction terms. Only p-values for each covariate effect are reported in lieu of the multiple β’s present, because of the levels of the categoric variables. Standardized regression coefficients (β) and p-values are shown for the continuous AIQ variables in Models A and B. Incremental adjusted R2 for Models A and B were calculated as the difference with the baseline model.