Table 2.
Mean and the 15th and 85th percentiles of the body mass index in adolescents by sex, age, and country
| Participants | No. | Body mass index | ||
|---|---|---|---|---|
| mean (95% confidence interval)* | 15th percentile | 85th percentile | ||
| Boys: | ||||
| 13-y-old: | ||||
| Lithuania | 685 | 18.5 (18.3-18.6) | 16.2 | 20.8 |
| Croatia | 748 | 19.2 (19.0-19.4) | 16.6 | 21.9 |
| United States | 788 | 20.6 (20.4-20.9) | 16.9 | 24.7 |
| 15-y-old: | ||||
| Lithuania | 803 | 19.9 (19.8-20.1) | 17.8 | 22.1 |
| Croatia | 591 | 20.7 (20.5-21.0) | 18.0 | 23.7 |
| United States | 697 | 22.7 (22.4-23.0) | 18.9 | 27.1 |
| Girls: | ||||
| 13-y-old: | ||||
| Lithuania | 718 | 18.4 (18.2-18.6)† | 16.2 | 20.6 |
| Croatia | 682 | 18.9 (18.7-19.1)† | 16.5 | 21.5 |
| United States | 894 | 20.2 (20.0-20.4) | 16.9 | 23.8 |
| 15-y-old: | ||||
| Lithuania | 796 | 19.7 (19.5-19.8) | 17.3 | 21.8 |
| Croatia | 797 | 20.2 (20.0-20.4) | 17.8 | 22.6 |
| United States | 829 | 21.7 (21.4-21.9) | 18.3 | 25.5 |
*P<0.001 for both sexes and ages; F-ratio.
†P = 0.003 for this pair of means and P<0.001 for the remaining pairs of means, post hoc least statistical difference test in analysis of variance.