Table 4.
Fit indices and reliabilities for the self-management strategies, social–cognitive, enjoyment, and physical activity measures
| Combined samples
|
||||||
|---|---|---|---|---|---|---|
| Measure sample | χ2 (df) | RMSEA (90% CI) | CFI | NNFI | Cronbach α | Stability |
| Self-management strategies | ||||||
| 6th grade | 28.1 (19) | 0.04 (0.00–0.07) | 0.98 | 0.97 | 0.83 | 0.84 |
| 8th grade | 45.0 (19) | 0.07 (0.04–0.09) | 0.97 | 0.94 | ||
| Self-efficacy | ||||||
| 6th grade | 43.4 (20) | 0.06 (0.04–0.09) | 0.96 | 0.94 | 0.79 | 0.78 |
| 8th grade | 32.5 (20) | 0.05 (0.01–0.07) | 0.97 | 0.96 | ||
| Perceived barriers | ||||||
| 6th grade | 41.5 (35) | 0.02 (0.00–0.05) | 0.99 | 0.98 | 0.77 | 0.77 |
| 8th grade | 69.2 (34) | 0.06 (0.04–0.08) | 0.94 | 0.92 | ||
| Outcome expectancy value | ||||||
| 6th grade | 59.8 (24) | 0.07 (0.05–0.09) | 0.97 | 0.95 | 0.86 | 0.64 |
| 8th grade | 72.0 (24) | 0.08 (0.06–0.11) | 0.96 | 0.93 | ||
| Enjoyment | ||||||
| 6th grade | 50.6 (14) | 0.09 (0.07–0.12) | 0.94 | 0.91 | 0.84 | 0.73 |
| 8th grade | 35.1 (14) | 0.07 (0.04–0.10) | 0.97 | 0.96 | ||
| Physical activity | ||||||
| 6th grade | 1.3 (5) | 0.00 (0.00–0.02) | 1.00 | 1.04 | 0.61 | 0.81 |
| 8th grade | 5.5 (5) | 0.02 (0.00–0.09) | 1.00 | 0.99 | ||
CI, confidence interval; CFI, comparative fit index; NNFI, non-normed fit index; RMSEA, root mean square error of approximation.