Table 1.
Descriptive statistics for the sample (n = 579).
| Characteristics | Boys (n = 280) | Girls (n = 299) | p | |
|---|---|---|---|---|
| Age, years (m ± SD) | 15.0 ± 0.4 | 14.9 ± 0.4 | 0.011 | |
| Body mass, % | Underweight | 7.2 | 15.2 | 0.008 |
| Normal weight | 80.1 | 75.1 | ||
| Overweight/obesity | 12.7 | 9.7 | ||
| Body mass perception adequacy, % | Overestimation | 13.2 | 55.4 | <0.0001 |
| Adequate estimation | 25.6 | 34.4 | ||
| Underestimation | 61.2 | 10.2 | ||
| Vigorous exercising | Never or rarely | 6.3 | 25.9 | <0.0001 |
| Sometimes | 38.1 | 57.8 | ||
| Often | 55.6 | 16.3 | ||
| Disordered eating | <10 scores, % | 84.3 | 76.9 | 0.052 |
| 10–19 scores, % | 8.6 | 14.7 | ||
| ≥20 scores, % | 7.1 | 8.4 | ||
| Difference between desired and estimated body mass, m ± SD | 7.5 ± 12.0 | −2.9 ± 5.8 | <0.0001 | |
| Leisure time exercise, m ± SD | 66.7 ± 34.5 | 47.8 ± 27.2 | <0.0001 | |
| Nutrition score, m ± SD | 19.1 ± 4.0 | 18.6 ± 3.6 | 0.200 | |
| No. of meals per day, m ± SD | 4.1 ± 1.4 | 3.7 ± 1.2 | <0.0001 | |
| Frequency of having breakfast *, m ± SD | 2.3 ± 0.9 | 2.0 ± 1.0 | 0.003 | |
| Self-esteem, m ± SD | 30.9 ± 4.3 | 29.1 ± 4.7 | <0.0001 | |
| Body dissatisfaction, m ± SD | 1.2 ± 1.0 | 1.7 ± 1.2 | <0.0001 | |
| Drive for thinness, m ± SD | 0.6 ± 0.9 | 1.0 ± 1.1 | <0.0001 | |
| Muscularity—oriented body image attitudes, m ± SD | 3.68 ± 1.21 | - | - | |
| Social physique anxiety, m ± SD | 2.1 ± 0.8 | 2.6 ± 0.9 | <0.0001 | |
* from 0 (never) up to 3 (always). n = number, % = percentage, m = mean, SD = standard deviation, p = statistical significance level.