Table 1. Baseline characteristics of Iranian adolescents in national and sub-national levels: the CASPIAN III Study .
| Variable | Regions | |||||
| Southeast | North- northeast | West | Central | National | P for trend 2 | |
| Mean (SD) 1 | Mean ( SD ) 1 | Mean ( SD ) 1 | Mean ( SD ) 1 | Mean ( SD ) 1 | ||
| WC (cm) | 68.68 (33.08) | 68.24 (20.64) | 68.26 (21.51) | 69.71(12.35) | 68.72(20.67) | 0.132 |
| BMI (kg/m2) | 18.46 (3.81) | 19.59 (4.23) | 19.26 (3.90) | 19.86(4.30) | 19.42(4.10) | <0.001 |
| Age (years) | 14.49 (2.58) | 14.71 (2.36) | 14.78(2.38) | 14.72(2.40) | 14.72 (2.40) | 0.112 |
| Sex (boy) | 288 (50.8) | 539 (50.1) | 1209 (51.0) | 811 (48.6) | 2847 (50.1) | 0.351 |
Abbreviations: SE: standard error of mean, CI: confidence interval, WC: waist circumference, BMI: body mass index.
1For sex data are presented as N (%).
2 P values are resulted from ANOVA test except for sex which is resulted from chi-square test.