Table 4.
Overall activity distributions and bivariate associations with BMI 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 | |||||||||
| Total active time | <.001 |
|
.008 | |||||||||||||
|
|
0-9 | 8 (1.4) | 32.7 (8.2) |
|
0-9 | 366 (62.5) | 28.2 (6.2) |
|
||||||||
|
|
10-19 | 184 (31.4) | 29.1 (7.1) |
|
10-19 | 153 (26.1) | 26.8 (5.5) |
|
||||||||
|
|
20-29 | 285 (48.6) | 27.2 (5.0) |
|
20-29 | 46 (7.8) | 26.9 (6.1) |
|
||||||||
|
|
30-39 | 99 (16.9) | 26.1 (5.7) |
|
30-39 | 12 (2.0) | 26.8 (5.3) |
|
||||||||
|
|
40+ | 10 (1.7) | 25.3 (3.1) |
|
40+ | 9 (1.5) | 25.1 (3.0) |
|
||||||||
| Overall activity, (steps/d) | <.001 |
|
c | |||||||||||||
|
|
0-2999 | 14 (2.4) | 31.0 (8.1) |
|
c | c | c |
|
||||||||
|
|
3000-5999 | 107 (18.3) | 30.6 (7.8) |
|
c | c | c |
|
||||||||
|
|
6000-8999 | 191 (32.6) | 27.6 (5.0) |
|
c | c | c |
|
||||||||
|
|
9000-11,999 | 166 (28.3) | 26.9 (4.7) |
|
c | c | c |
|
||||||||
|
|
12,000-14,999 | 70 (11.9) | 25.5 (4.8) |
|
c | c | c |
|
||||||||
|
|
15,000+ | 38 (6.5) | 25.4 (7.2) |
|
c | c | c |
|
||||||||
| Overall activity, (MET-h/wk) | c |
|
.006 | |||||||||||||
|
|
c | c | c |
|
0-19 | 155 (26.4) | 29.2 (7.4) |
|
||||||||
|
|
c | c | c |
|
20-39 | 181 (30.9) | 27.3 (5.1) |
|
||||||||
|
|
c | c | c |
|
40-59 | 103 (17.6) | 27.2 (5.0) |
|
||||||||
|
|
c | c | c |
|
60-79 | 68 (11.6) | 26.5 (6.3) |
|
||||||||
|
|
c | c | c |
|
80-99 | 32 (5.5) | 26.0 (4.1) |
|
||||||||
|
|
c | c | c |
|
100+ | 47 (8.0) | 27.3 (5.5) |
|
||||||||
aData are 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.
cCells omitted because overall activity was measured on different scales (Fitbit, steps/d; IPAQ, MET-h/wk).