Table 3.
Activity distributions and bivariate associations with BMI by activity intensity in the BMI analysis subset (n=586)a.
| Fitbit | IPAQb | |||||||||||||||
| Time (h/wk) | n (%) | BMI, mean (SD) | P value | Time (h/wk) | n (%) | BMI, mean (SD) | P value | |||||||||
| Sedentary | .01 |
|
.001 | |||||||||||||
|
|
0-19 | 0 | N/Ac |
|
0-19 | 101 (17.2) | 26.4 (5.2) |
|
||||||||
|
|
20-39 | 0 | N/A |
|
20-39 | 159 (27.1) | 26.9 (5.0) |
|
||||||||
|
|
40-59 | 4 (0.7) | 28.2 (7.8) |
|
40-59 | 197 (33.6) | 28.0 (6.2) |
|
||||||||
|
|
60-79 | 133 (22.7) | 26.5 (5.7) |
|
60-79 | 93 (15.9) | 28.1 (6.0) |
|
||||||||
|
|
80+ | 449 (76.6) | 28.0 (6.0) |
|
80+ | 36 (6.1) | 31.0 (8.6) |
|
||||||||
| Walking | .001 |
|
.01 | |||||||||||||
|
|
0-4 | 0 | N/A |
|
0-4 | 357 (60.9) | 28.0 (6.0) | |||||||||
|
|
5-9 | 19 (3.2) | 30.4 (7.8) |
|
5-9 | 136 (23.2) | 27.3 (5.5) |
|
||||||||
|
|
10-14 | 79 (13.5) | 28.8 (6.8) |
|
10-14 | 49 (8.4) | 27.6 (7.6) |
|
||||||||
|
|
15-19 | 170 (29.0) | 28.4 (6.6) |
|
15-19 | 12 (2.0) | 26.6 (5.3) |
|
||||||||
|
|
20-24 | 158 (27.0) | 27.3 (6.0) |
|
20-24 | 32 (5.5) | 25.4 (4.8) |
|
||||||||
|
|
25+ | 160 (27.3) | 26.3 (4.0) |
|
25+ | 0 | N/A |
|
||||||||
| Moderate activity | <.001 |
|
.19 | |||||||||||||
|
|
0-1 | 241 (41.1) | 28.7 (6.4) |
|
0-1 | 194 (33.1) | 28.3 (7.0) | |||||||||
|
|
1-2 | 134 (22.9) | 27.5 (5.1) |
|
1-2 | 113 (19.3) | 27.3 (5.9) |
|
||||||||
|
|
2-3 | 82 (14.0) | 26.8 (5.4) |
|
2-3 | 90 (15.4) | 27.8 (5.2) |
|
||||||||
|
|
3-4 | 53 (9.0) | 26.8 (5.5) |
|
3-4 | 64 (10.9) | 27.3 (5.2) |
|
||||||||
|
|
4-5 | 26 (4.4) | 25.5 (4.4) |
|
4-5 | 33 (5.6) | 27.3 (4.9) |
|
||||||||
|
|
5+ | 50 (8.5) | 26.0 (7.1) |
|
5+ | 92 (15.7) | 26.8 (5.0) |
|
||||||||
| Vigorous activity | <.001 |
|
.13 | |||||||||||||
|
|
0-1 | 534 (91.1) | 27.9 (5.9) |
|
0-1 | 249 (42.5) | 28.4 (6.5) | |||||||||
|
|
1-2 | 29 (4.9) | 26.5 (8.2) |
|
1-2 | 99 (16.9) | 27.4 (6.5) |
|
||||||||
|
|
2-3 | 13 (2.2) | 22.8 (1.9) |
|
2-3 | 84 (14.3) | 26.9 (5.7) |
|
||||||||
|
|
3-4 | 5 (0.9) | 23.7 (2.5) |
|
3-4 | 43 (7.3) | 26.4 (3.6) |
|
||||||||
|
|
4-5 | 3 (0.5) | 25.8 (7.7) |
|
4-5 | 44 (7.5) | 28.2 (5.6) |
|
||||||||
|
|
5+ | 2 (0.3) | 24.0 (1.9) |
|
5+ | 67 (11.4) | 26.6 (4.2) |
|
||||||||
aData were restricted to the first activity observation (586 observations). P values are for nonparametric test-of-trend across heuristically defined categories of time spent at each level of activity.
bIPAQ: International Physical Activity Questionnaire.
cN/A: not applicable.