Table 3.
Physical activity levels based upon gaining or not gaining ≥1 lb
| Baseline to Month 4 change | Baseline to Year 1 change | Baseline to Year 2 change | Mixed effects model* | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| N | Mean ± std. dev Median (IQR) | p-value+ | N | Mean ± std. dev Median (IQR) | p-value+ | N | Mean ± std. dev Median (IQR) | p-value+ | Beta coefficient (std err) | p-value | ||
| Change in daily steps | ||||||||||||
| Gained >1 lb. from baseline to Year 2 | Yes | 182 | −49 ± 2964 −104 (−1436, 1588) |
0.1253 | 158 | −346 ± 2598 −40 (−1794, 1137) |
0.3328 | 173 | −568 ± 2947 −388 (−2480, 1224) |
0.1015 | −302 (201) | 0.1346 |
| No | 275 | 304 ± 2525 375 (−1017, 1654) |
263 | 111 ± 2798 −37 (−1583, 1714) |
271 | 27 ± 3073 −45 (−1837, 1875) |
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| Change in bout-related MVPA (min/week) | ||||||||||||
| gained >1 lb. from baseline to Year 2 | Yes | 182 | 14.2 ± 239.7 0.0 (−90.3, 112.0) |
0.0189* | 158 | −37.9 ± 276.9 −20.2 (−122.8, 80.5) |
0.0051** | 173 | −34.4 ± 313.3 −40.0 (−144.7,89.0) |
0.0023** | −47.8 (19.1) |
0.0125* |
| No | 275 | 49.8 ± 234.0 51.0 (−59.0, 186.4) |
263 | 39.5 ± 279.2 25.9 (−90.0, 139.0) |
271 | 59.2 ± 334.4 22.8 (−94.0,163.3) |
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+ p-value obtained using the Wilcoxon Rank Sum Test. Mixed effects model examines the change in physical activity across all time points. Other variables included in this model are: clinic, gender, race, total daily caloric intake, percentage of calories consumed from dietary fat, armband wear time, baseline value of outcome measure, treatment group, and treatment group x time interaction. Boldface indicates statistical significance (*p < 0.05, **p < 0.01)