Table 2.
Linear mixed-effects model results for MVPA outcomes
| Variables | Post-intervention 7-day MVPA | Follow-up 7-day MVPA | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Estimate | LCL | UCL | p Value | FMI | Estimate | LCL | UCL | p Value | FMI | |
| Intercept | 1.34 | 1.04 | 1.65 | <.001 | 0.14 | 1.18 | 0.90 | 1.45 | <.001 | 0.19 |
| Intervention (ref: control) | –0.08 | –0.21 | 0.05 | .207 | 0.11 | –0.09 | –0.21 | 0.02 | .118 | 0.23 |
| Age (centered, 12 years) | –0.02 | –0.10 | 0.07 | .733 | 0.09 | –0.01 | –0.09 | 0.07 | .832 | 0.20 |
| Black (ref: no) | –0.07 | –0.22 | 0.08 | .383 | 0.15 | 0.03 | –0.10 | 0.16 | .654 | 0.21 |
| Lunch (ref: no) | 0.11 | –0.07 | 0.28 | .231 | 0.08 | 0.03 | –0.13 | 0.19 | .729 | 0.24 |
| Hispanic (ref: no) | –0.06 | –0.27 | 0.15 | .572 | 0.26 | –0.10 | –0.28 | 0.08 | .263 | 0.31 |
| BMI z-score | –0.08 | –0.14 | –0.01 | .017 | 0.11 | –0.01 | –0.07 | 0.05 | .772 | 0.22 |
| Baseline MVPA | 0.66 | 0.60 | 0.71 | <.001 | 0.16 | 0.45 | 0.41 | 0.50 | <.001 | 0.18 |
| Puberty stage (ref: early) | –0.02 | –0.18 | 0.14 | .824 | 0.16 | 0.09 | –0.06 | 0.23 | .232 | 0.27 |
| Study Year 2 (ref: year 1) | 0.13 | –0.11 | 0.37 | .299 | 0.09 | 0.08 | –0.14 | 0.30 | .459 | 0.05 |
| Study Year 3 (ref: year 1) | 0.07 | –0.16 | 0.31 | .544 | 0.12 | 0.17 | –0.05 | 0.39 | .126 | 0.11 |
| Model fit statistics: MI = 20, null ICC = 0.0126, residual ICC = 0.0091, partial η2 (intervention) = 0.0013, marginal R-squared = 0.3328, conditional R-squared = 0.3383, null model AIC = 5518, full model AIC = 4928, null model BIC = 5534, full model BIC = 4997 | Model fit statistics: MI = 20, null ICC = 0.0104, residual ICC = 0.0133, partial η2 (intervention) = 0.0023, marginal R-squared = 0.2562, conditional R-squared = 0.2661, null model AIC = 4778, full model AIC = 4357, null model BIC = 4794, full model BIC = 4426 | |||||||||
Boldface implies significant at p value <.05. BMI body mass index; LCL lower confidence limit; UCL upper confidence limit; FMI fraction of missing information; MVPA moderate-to-vigorous physical activity; MI multiple imputation; ICC intraclass correlation coefficient; AIC Akaike information criterion; BIC Bayesian information criterion.