Table 1.
Characteristics of the study subjects from the Anqing twin cohort
| Variables | Mean± sd
|
||
|---|---|---|---|
| Boys (n = 497) | Girls (n = 524) | P value | |
| Age, yr | 16.0 ± 1.8 | 16.4 ± 1.9 | 0.006 |
| Height, cm | 159.6 ± 8.5 | 152.5 ± 5.3 | <0.001 |
| Weight, kg | 47.2 ± 8.2 | 46.0 ± 6.5 | 0.044 |
| BMI, kg/m2 | 18.4 ± 2.1 | 19.7 ± 2.3 | <0.001 |
| WC, cm | 64.0 ± 5.7 | 65.8 ± 6.3 | 0.010 |
| FMI, kg/m2 | 2.2 ± 1.3 | 5.5 ± 1.7 | <0.001 |
| %BF, % | 11.8 ± 5.3 | 27.2 ± 5.7 | <0.001 |
| %TF, % | 44.2 ± 6.4 | 48.3 ± 4.3 | <0.001 |
| Leptin, ng/mla | 1.99 ± 2.13 | 8.20 ± 5.48 | <0.001 |
| Leptin/%BFa | 16.3 ± 14.6 | 29.1 ± 15.9 | <0.001 |
| Tanner stages, n (%) | |||
| I | 70 (14.1) | 8 (1.5) | |
| II | 114 (22.9) | 92 (17.6) | |
| III | 130 (26.2) | 212 (41.5) | |
| IV | 146 (29.4) | 153 (29.2) | |
| V | 37 (7.4) | 59 (11.3) | <0.001 |
a
For all statistical analyses in this article, leptin values were natural logarithm transformed to better approximate normal distribution.