Table 2.
Body composition and physical activity according to ethnicity
| Variable | Ethnicity, n (%) | Chi2-test | ||
|---|---|---|---|---|
| Black | South Asian | White/Other | Pearson-χ2; p-value | |
| Age- and sex-adjusted BMI z-score | ||||
| < 5th percentile, ‘underweight’ | 9 (1.8) | 46 (8.9) | 20 (2.3) | 88.8; <.001*** |
| 5th–85th percentile, ‘normal weight’ | 275 (56.1) | 353 (68.5) | 599 (67.8) | |
| 85th–95th percentile, ‘overweight’ | 71 (14.5) | 46 (8.9) | 117 (13.2) | |
| > 95th percentile, ‘obese’ | 135 (27.6) | 70 (13.6) | 148 (16.7) | |
| ln(FMI) z-score | ||||
| < 5th percentile | 23 (4.7) | 8 (1.5) | 25 (2.8) | 39.7: <.001*** |
| 5th–85th percentile | 359 (73.3) | 435 (84.5) | 752 (85.1) | |
| 85th–95th percentile | 63 (12.8) | 37 (7.2) | 72 (8.1) | |
| > 95th percentile | 45 (9.2) | 35 (6.8) | 35 (4.0) | |
| FFMI z-score | ||||
| < 5th percentile | 7 (1.4) | 46 (8.9) | 8 (0.9) | 163.6; <.001*** |
| 5th–85th percentile | 365 (74.5) | 448 (87.0) | 751 (85.9) | |
| 85th–95th percentile | 62 (12.7) | 15 (2.9) | 90 (10.2) | |
| > 95th percentile | 56 (11.4) | 6 (1.2) | 35 (4.0) | |
| General Sports Frequency | ||||
| Never | 5 (1.0) | 4 (0.8) | 17 (1.9) | 19.5; .013* |
| Less than weekly | 21 (4.3) | 21 (4.1) | 31 (3.5) | |
| Weekly | 112 (22.9) | 118 (22.9) | 246 (27.8) | |
| Most days | 126 (25.7) | 116 (22.5) | 239 (27.0) | |
| Daily | 226 (46.1) | 256 (49.7) | 351 (39.7) | |
| Dominant mode of commuting | ||||
| Active | 204 (41.6) | 249 (48.3) | 430 (48.6) | 10.4; .108 |
| Passive | 158 (32.3) | 159 (30.9) | 281 (31.8) | |
| Mixed | 3 (0.6) | 2 (0.4) | 4 (0.5) | |
| Disagreement child-parent | 125 (25.5) | 105 (20.4) | 169 (19.1) | |
BMI Body Mass Index, FMI Fat Mass Index, FFMI Fat-Free Mass Index
*: p < .05; **: p < .01; ***: p < .001
Significant associations (p < .05) on the first level of the multilevel model are in bold