Table 3. Intervention Effects on Accelerometer-Measured and Self-Reported Physical Activity Outcomes.
| Physical Activity Outcome | Baseline to Month 3 | Month 3 to Month 9 | ||||||
|---|---|---|---|---|---|---|---|---|
| Net Effect, Intervention vs Control (95% CI) | P Value | Difference in Trends, Plus vs Regular (95% CI)a | P Value | Difference in Level, Plus vs Regular (95% CI)a | P Value | Difference in Level, Intervention vs Control (95% CI)a | P Value | |
| Intention-to-Treat | ||||||||
| Accelerometer | ||||||||
| Steps/d, No. | 2060 (1296 to 2825) | <.001 | −245 (−907 to 417) | .47 | 900 (94 to 1707) | .03 | 1360 (694 to 2026) | <.001 |
| Steps/h, No. | 139 (86.4 to 191.0) | <.001 | −20.8 (−68.1 to 26.4) | .39 | 62.2 (8.2 to 116.1) | .02 | 83.7 (38.7 to 128.8) | <.001 |
| Moderate physical activity, min/d | 16.3 (9.4 to 23.2) | <.001 | −4.9 (−11.2 to 1.4) | .13 | 4.6 (−2.6 to 11.7) | .21 | 7.3 (1.2 to 13.5) | .02 |
| Vigorous physical activity, min/d | 1.8 (0.7 to 3.0) | .002 | −0.3 (−1.4 to 0.9) | .68 | 0.3 (−0.7 to 1.4) | .55 | 1.1 (0.4 to 1.9) | .004 |
| Moderate to vigorous physical activity, min/d | 18.2 (10.9 to 25.4) | <.001 | −5.2 (−11.9 to 1.4) | .13 | 4.9 (−2.7 to 12.5) | .21 | 8.4 (2.0 to 14.9) | .01 |
| Self-report | ||||||||
| 7-d physical activity recall, kcal/kg/db | 0.84 (0.34 to 1.33) | .001 | 0.64 (−0.04 to 1.32) | .07 | 0.06 (−0.52 to 0.64) | .84 | 0.45 (−0.06 to 0.96) | .08 |
| Per-Protocol | ||||||||
| Accelerometer | ||||||||
| Steps/d, No. | 2077 (1310 to 2843) | <.001 | −224 (−888 to 440) | .51 | 903.0 (97.1 to 1709.3) | .03 | 1366 (700 to 2032) | <.001 |
| Steps/h, No. | 139 (87 to 192) | <.001 | −19.6 (−66.9 to 27.7) | .42 | 62.3 (8.5 to 116.2) | .02 | 84.0 (39.0 to 129.0) | <.001 |
a
Differences on level and trend reflect comparisons of the mean level of the outcome and of the fitted change per month from month 3 to month 9, respectively.
b
The interviewer-administered 7-Day Physical Activity Recall questionnaire was used to obtain self-reported activity.