Table 1.
Baseline characteristics of study participants by sex (Japan, 2002–2007) (n=1431)
| Variable | Boys | Girls | P-value |
|---|---|---|---|
| (n=723) | (n=708) | ||
| Age (years), mean (SD) | 9.4 (0.5) | 9.4 (0.5) | 0.961 |
| Height (cm), mean (SD) | 134.8 (5.4) | 134.8 (6.2) | 0.968 |
| Weight (kg), mean (SD) | 30.3 (3.7) | 29.9 (4.1) | 0.129 |
| BMI (kg/m2), mean (SD) | 16.6 (1.3) | 16.4 (1.3) | 0.004 |
| Seif-perceived weight status, n (%) | |||
| Thin | 207 (28.6) | 151 (21.3) | 0.001 |
| Normal | 480 (66.4) | 498 (70.3) | |
| Heavy | 36 (5.0) | 59 (8.3) |
The unpaired t-test and chi-square test were used to compare characteristics between sexes
SD standard deviation, BMI body mass index