Table 2.
Daily accelerometer estimates across valid wear days overall and by intervention group (N=215).
| Accelerometer variablesa | Total sample (N=215) | Intervention group (n=95) | Control group (n=120) | P |
| Mean daily wear time (minutes/day), mean (SD) | 843.63 (99.38) | 829.96 (96.28) | 854.46 (100.86) | .07 |
| Total days of observation (out of 7 possible), mean (SD) | 5.87 (1.45) | 5.74 (1.52) | 5.98 (1.39) | .23 |
| Sedentary, daily minutes, mean (SD) | 531.64 (100.96) | 507.20 (101.01) | 550.99 (97.04) | .001 |
| Sedentary, % of daily wear time, mean (SD) | 62.92 (8.89) | 61.08 (9.72) | 64.38 (7.91) | .007 |
| Active, daily minutes, mean (SD) | 310.94 (80.59) | 322.37 (88.01) | 301.88 (73.30) | .06 |
| Active, % of daily wear time, mean (SD) | 36.96 (8.88) | 38.87 (9.71) | 35.44 (7.88) | .005 |
| Light intensity, daily minutes, mean (SD) | 215.12 (55.52) | 222.83 (56.50) | 209.01 (54.19) | .07 |
| Light intensity, % of daily wear time, mean (SD) | 25.54 (5.95) | 26.87 (5.93) | 24.49 (5.78) | .003 |
| Moderate lifestyle intensity, daily minutes, mean (SD) | 71.54 (31.07) | 74.80 (35.90) | 68.96 (26.51) | .17 |
| Moderate lifestyle intensity, % of daily wear time, mean (SD) | 8.53 (3.70) | 9.03 (4.27) | 8.14 (3.13) | .08 |
| Inactive-to-active transitions, daily total, mean (SD) | 94.17 (17.03) | 94.53 (16.25) | 93.88 (17.70) | .78 |
| Total active minutes (10 minutes postprompt), mean (SD)b | 2.44 (1.02) | 2.59 (1.15) | 2.32 (0.88) | .05 |
| Total accelerometer counts (10 minutes postprompt), mean (SD)b | 1782.07 (1096.64) | 1970.61 (1322.76) | 1629.29 (847.40) | .03 |
aAccelerometer estimates were defined as follows: sedentary activity was defined as less than 100 counts per minute, active time was defined as 100 or more counts per minute, light-intensity activity was defined as 100-759 counts per minute, and moderate lifestyle intensity activity was defined as 760-1951 counts per minute. An inactive-active transition (ie, sedentary break) was defined as a transition from less than 100 counts to 100 or more counts/minute.
b Sample size slightly reduced (N=210) because 5 participants had no reports of sitting during random mobile phone assessments.