Table 2.
Distribution of body mass index (BMI) z-score, BMI categories and motor skills
| Boys | Girls | |||
|---|---|---|---|---|
|
4 y n = 2 450a |
5-6 y n = 2 300 |
4 y n = 2 700 |
5-6 y n = 2 400 |
|
| Body mass index (BMI) | ||||
| Z-score (mean, SE) | 0.62 (0.03) | 0.63 (0.03) | 0.63 (0.03) | 0.65 (0.03) |
| CDC categories (%) | ||||
| Underweight | 2.2 | 1.9 | 1.8 | 1.9 |
| Normal | 63.8 | 65.1 | 63.6 | 64.1 |
| Overweight | 17.3 | 17.2 | 19.5 | 18.7 |
| Obesity | 16.8 | 16.1 | 15.1 | 15.1 |
| IOTF and Cole categoriesb (%) | ||||
| Underweight | 0.9 | 0.5 | 0.8 | 0.5 |
| Normal | 77.1 | 75.9 | 73.5 | 70.1 |
| Overweight | 15.7 | 16.6 | 17.2 | 19.0 |
| Obesity | 6.3 | 7.0 | 8.5 | 10.4 |
| Motor skillc | ||||
| Gross motor skill | ||||
| Balance at least 10 sec. (%) | ||||
| Right foot | 45.8 | 75.0 | 53.6 | 83.3 |
| Left foot | 44.6 | 74.4 | 52.5 | 81.9 |
| Hop 5 times (%) | ||||
| Right foot | 66.2 | 88.1 | 70.4 | 92.2 |
| Left foot | 61.3 | 85.5 | 63.9 | 89.8 |
| Jump distance (inches) (mean, SE) | 27.9 (0.24) | 32.4 (0.28) | 24.7 (0.28) | 29.9 (0.31) |
| Skip at least 8 steps (%) | 20.5 | 37.7 | 32.4 | 59.2 |
| Walk backwards 6 steps on line (%) | 33.9 | 38.3 | 40.9 | 48.6 |
| Bean bag catch (at least 5 caught) (%) | 42.1 | 51.8 | 38.3 | 50.8 |
| Fine motor skillc | ||||
| Blocks (%) | ||||
| Passed one (either tower or gate) | 44.1 | - | 44.9 | - |
| Passed both | 42.9 | - | 42.9 | - |
| Gate passed | - | 79.2 | - | 81.8 |
| Copy form (mean, SE) | 3.2 (0.04) | 2.5 (0.04) | 3.8 (0.04) | 2.3 (0.04) |
Estimations of percentages, means and standard errors of the mean (SE) are weighted and take into account the complex sampling design.
BMI; Body mass index, CDC; Centers for Disease Control and prevention, IOTF; International Obesity Task Force
aUnweighted sample size rounded to the nearest 50. bSee definitions in the Methods section. cPercentages of passing the test are presented (except for jump distance).