Table 3.
Differences in self-reported physical activity and sedentary behavior at baseline (T0), 4 weeks (T1), and 8 weeks (T2) according to history of activity tracker use (N=87).
| Variable | Friedman test | T0, mean (SD) | T1, mean (SD) | T2, mean (SD) | P value within-subject effect (time)a | ||||||||||
|
|
χ2 (df=2) | P value |
|
|
|
T0 vs T1 | T0 vs T2 | ||||||||
| Prior use of activity tracker (n=40) | |||||||||||||||
|
|
Walking (min/week) | 6.993 | .03 | 186.00 (238.22) | 168.50 (145.51) | 208.75 (185.72) | .38 | .07 | |||||||
|
|
MPAb (min/week) | 1.476 | .48 | 62.5 (95.48) | 67.25 (92.68) | 76.50 (110.70) | — | — | |||||||
|
|
VPAc (min/week) | 1.317 | .52 | 69.00 (77.65) | 72.5 (80.69) | 78.5 (78.92) | — | — | |||||||
|
|
Total PAd (METe min/week) | 4.088 | .13 | 1398.80 (1269.45) | 1384.05 (1165.64) | 1614.88 (1369.12) | — | — | |||||||
|
|
Days of MVPAf≥30 min/day | 0.774 | .68 | 2.70 (1.94) | 3.25 (1.86) | 3.37 (2.03) | — | — | |||||||
|
|
Sitting (min/day) | 11.036 | .004 | 365.50 (203.61) | 285.00 (182.01) | 292.50 (192.80) | .002 | .04 | |||||||
|
|
Screen time (min/day) | 3.263 | .20 | 195.25 (173.31) | 154.25 (108.96) | 162.25 (168.96) | — | — | |||||||
| Never used activity tracker (n=47) | |||||||||||||||
|
|
Walking (min/week) | 3.012 | .22 | 175.53 (284.74) | 167.23 (165.03) | 292.13 (391.49) | — | — | |||||||
|
|
MPA (min/week) | 4.114 | .13 | 59.79 (79.63) | 60.85 (102.42) | 103.19 (190.47) | — | — | |||||||
|
|
VPA (min/week) | 0.013 | .99 | 57.45 (70.42) | 58.72 (84.20) | 70.64 (134.28) | — | — | |||||||
|
|
Total PA (MET min/week) | 0.973 | .62 | 1287.34 (1411.50) | 1273.57 (1277.72) | 2072.11 (2637.84) | — | — | |||||||
|
|
Days of MVPA≥30 min/day | 1.244 | .54 | 2.79 (2.03) | 3.08 (2.19) | 2.98 (1.97) | — | — | |||||||
|
|
Sitting (min/day) | 4.333 | .12 | 307.66 (198.22) | 239.57 (187.16) | 245.53 (187.06) | — | — | |||||||
|
|
Screen time (min/day) | 3.810 | .15 | 159.36 (139.36) | 136.60 (153.07) | 131.06 (127.66) |
— | — | |||||||
aWilcoxon signed-rank tests with P<.025 (planned comparisons T0 vs T1 and T0 vs T1) considered statistically significant. The Wilcoxon signed-rank test was only undertaken when the Friedman test was significant (P<.05).
bMPA: moderate-intensity physical activity.
cVPA: vigorous-intensity physical activity.
dPA: physical activity.
eMET: metabolic equivalent.
fMVPA: moderate-to-vigorous physical activity.