Table 2.
Changes in outcome variables for intention-to-treat (n=1328) and completer (n=224) analyses.
|
Outcome variables |
Web 1.0: 10,000 Steps |
Web 2.0: WALK 2.0 |
Difference in between- group changes (95% CI) |
Z or ta | P valueb | ||||
|
Baseline, mean (SD) |
3 months, mean (SD/SEc) |
Baseline, mean (SD) |
3 months, mean (SD/SEc) |
||||||
| Total physical activity (min/week)d | |||||||||
| Intention-to-treat | 341.9 (353.8) | 381.7 (16.6) | 334.0 (342.2) | 473.9 (26.4) | +92.78 (28.78- 156.77) | 2.91 | .005 | ||
| Completers | 341.9 (353.8) | 385.2 (269.5) | 334.0 (342.2) | 464.5 (359.0) | +56.65 (-30.35-143.64) | 1.28 | .20 | ||
| Quality of lifee | |||||||||
| Physical functioning | |||||||||
| Intention-to-treat | 88.8 (15.5) | 89.1 (0.8) | 88.5 (16.2) | 92.7 (0.5) | +3.58 (1.66-5.49) | 3.72 | ˂.001 | ||
| Completers | 88.8 (15.5) | 89.6 (14.5) | 88.5 (16.2) | 92.9 (7.7) | +3.79 (0.68-6.91) | 2.39 | .02 | ||
| Role limitations due to physical health problems | |||||||||
| Intention-to-treat | 83.8 (29.3) | 83.8 (1.6) | 84.2 (29.0) | 84.2 (1.7) | +0.38 (-4.85-5.62) | 0.15 | .88 | ||
| Completers | 83.8 (29.3) | 84.2 (29.0) | 84.2 (29.0) | 85.3 (28.0) | -0.14 (-8.18-7.90) | 0.04 | .97 | ||
| Role limitation due to personal or emotional problems | |||||||||
| Intention-to-treat | 74.3 (36.9) | 80.6 (2.1) | 76.2 (36.8) | 84.0 (1.8) | +3.31 (-2.59-9.22) | 1.12 | .27 | ||
| Completers | 74.3 (36.9) | 80.1 (35.4) | 76.2 (36.8) | 85.0 (28.8) | +5.83 (-2.68-14.34) | 1.34 | .18 | ||
| Energy/fatigue | |||||||||
| Intention-to-treat | 50.0 (20.7) | 57.2 (1.1) | 51.4 (20.4) | 59.5 (1.4) | +2.28 (-1.49-6.06) | 1.21 | .23 | ||
| Completers | 50.0 (20.7) | 57.8 (21.2) | 51.4 (20.4) | 60.2 (19.0) | +1.55 (-2.84-5.94) | 0.69 | .49 | ||
| Emotional well-being | |||||||||
| Intention-to-treat | 69.3 (19.2) | 76.4 (0.9) | 70.2 (19.1) | 78.0 (1.0) | +1.55 (-1.25-4.34) | 1.11 | .27 | ||
| Completers | 69.3 (19.2) | 76.1 (15.6) | 70.2 (19.1) | 78.1 (16.1) | +1.16 (-2.39-4.71) | 0.64 | .52 | ||
| Social functioning | |||||||||
| Intention-to-treat | 79.5 (24.0) | 84.0 (1.3) | 80.7 (23.0) | 86.4 (1.2) | +2.28 (-1.48- 6.04) | 0.22 | .23 | ||
| Completers | 79.5 (24.0) | 84.4 (20.4) | 80.7 (23.0) | 87.2 (18.4) | +3.10 (-1.81-8.01) | 1.24 | .22 | ||
| Bodily pain | |||||||||
| Intention-to-treat | 79.1 (20.7) | 78.9 (1.2) | 80.6 (20.0) | 79.4 (1.5) | +0.32 (-3.29-3.92) | 0.18 | .86 | ||
| Completers | 79.1 (20.7) | 79.4 (19.7) | 80.6 (20.0) | 79.9 (19.0) | +0.18 (-4.82-5.19) | 0.07 | .94 | ||
| General health perceptions | |||||||||
| Intention-to-treat | 62.7 (20.1) | 66.6 (1.1) | 64.3 (20.4) | 69.5 (1.3) | +2.64 (-1.10-6.38) | 1.42 | .16 | ||
| Completers | 62.7 (20.1) | 67.4 (17.0) | 64.3 (20.4) | 69.7 (18.1) | +1.60 (-1.79-4.99) | 0.93 | .35 | ||
| Body mass index (kg/m2)f | |||||||||
| Intention-to-treat | 28.6 (6.4) | 28.3 (0.2) | 28.8 (6.5) | 27.3 (0.3) | -1.03 (-1.65-0.41) | 3.33 | .001 | ||
| Completers | 28.6 (6.4) | 26.8 (5.6) | 28.8 (6.5) | 27.2 (4.5) | -0.58 (-0.95-0.21) | 3.08 | .002 | ||
at values are presented for imputed data; Z values (Wald chi-square test: Z=sqrt[chisq]) are presented for completers data.
bStatistical significance is represented by P<.05.
cStandard error (SE) of the mean values are presented for imputed data (intention-to-treat); standard deviation (SD) values are presented for completers data.
dIn addition to controlling for baseline physical activity, the analyses were adjusted for gender, age, body mass index, and education.
eIn addition to controlling for the baseline value of the outcome variable, the analyses were adjusted for baseline physical activity, gender, age, body mass index, and education.
fIn addition to controlling for baseline body mass index, the analyses were adjusted for baseline physical activity, gender, age, and education.