Sample characteristics of selected variables by obesity* status
| Not obese | Obese | |||||||
|---|---|---|---|---|---|---|---|---|
| Per cent | N | Per cent | N | OR† | p Value‡ | |||
| Categorical variables | ||||||||
| Sex (% male) | 49.6 | 4183 | 50.7 | 286 | 1.04 | 0.720 | ||
| Head of household occupational social class (% manual) | 39.7 | 4183 | 49.0 | 286 | 1.46 | 0.002 | ||
| Median | IQR | N | Median | IQR | N | r† | p Value‡ | |
| Continuous variables | ||||||||
| Age (years) | 10.5 | (5.4) | 4183 | 10.4 | (4.6) | 286 | −0.01 | 0.699 |
| Portions of fruit and vegetable per day | 3.0 | (2.7) | 4183 | 3.0 | (3.3) | 286 | 0.00 | 0.807 |
| TV viewing (min/day) | 102.9 | (81.4) | 4183 | 120.0 | (102.9) | 286 | −0.09 | <0.001 |
| Non-TV leisure time sitting (min/day) | 98.6 | (77.1) | 4183 | 99.3 | (77.1) | 286 | 0.00 | 0.766 |
| Total leisure time sitting (min/day) | 210.0 | (128.6) | 4183 | 225.0 | (157.1) | 286 | −0.05 | 0.001 |
| Self-reported MVPA (min/day) | 40.7 | (64.3) | 4183 | 33.1 | (60.4) | 286 | −0.02 | 0.234 |
| Objectively measured sedentary time (100CPM) (min/day) | 372.4 | (145.2) | 670 | 403.3 | (162.5) | 35 | −0.03 | 0.467 |
| Objectively measured sedentary time (200CPM) (min/day) | 438.8 | (144.6) | 670 | 458.2 | (151.4) | 35 | −0.03 | 0.451 |
| Objectively measured MVPA time (min/day) | 58.5 | (54.8) | 670 | 42.7 | (34.6) | 35 | −0.09 | 0.022 |
| Accelerometer wear time per valid day (min) | 759.5 | (85.9) | 670 | 770.8 | (122.5) | 35 | −0.01 | 0.755 |
*Obesity status was classified using age-specific and sex-specific BMI cut-offs recommended by the Childhood Obesity Working Group of the International Obesity Taskforce.
†Effect size estimated by OR for categorical, and by r (calculated as Z/√N) from Mann-Whitney U test for continuous variables.
‡p Value was calculated by χ2 for categorical variables, and by Mann-Whitney U test for continuous variables.
BMI, body mass index; CPM, counts per minute; MVPA, moderate to vigorous physical activity.