Table 1. Characteristics of the children and adolescents in Hainan Province, China.
| Boys (n=681) | Girls (n=927) | All participants (n=1,608) | P | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Median/N | IQR/% | Median/N | IQR% | Median/N | IQR/% | ||||
| Age (years) | 12.86 | 5.31 | 13.77 | 6.2 | 13.37 | 5.94 | 0.001 | ||
| 7–8 | 44 | 6.46 | 67 | 7.23 | 111 | 6.90 | <0.001 | ||
| 9–10 | 149 | 21.88 | 184 | 19.85 | 333 | 20.71 | |||
| 11–12 | 160 | 23.49 | 158 | 17.04 | 318 | 19.78 | |||
| 13–14 | 120 | 17.62 | 103 | 11.11 | 223 | 13.87 | |||
| 15–16 | 92 | 13.51 | 183 | 19.74 | 275 | 17.10 | |||
| 17–18 | 116 | 17.03 | 232 | 25.03 | 348 | 21.64 | |||
| Resident area | 0.080 | ||||||||
| Urban | 390 | 57.27 | 571 | 61.60 | 961 | 59.76 | |||
| Rural | 291 | 42.73 | 356 | 38.40 | 647 | 40.24 | |||
| Stature (cm) | 150.7 | 26.8 | 151.2 | 16.8 | 151.1 | 20.85 | <0.001 | ||
| Weight (kg) | 38.8 | 21.5 | 40.1 | 16 | 39.6 | 17.5 | 0.045 | ||
| BMI (kg/m2) | 16.58 | 3.4 | 17.11 | 3.75 | 16.83 | 3.66 | 0.262 | ||
| FM (kg) | 3.2 | 3.9 | 7.9 | 6.9 | 5.3 | 6.9 | <0.001 | ||
| %BF (%) | 8.8 | 7 | 19.8 | 10.4 | 14 | 12.6 | <0.001 | ||
| FMI (kg/m2) | 1.44 | 1.4 | 3.39 | 2.39 | 2.29 | 2.56 | <0.001 | ||
| FFM (kg) | 33.8 | 17.4 | 31.6 | 9.1 | 32.05 | 10.95 | <0.001 | ||
| FFMI (kg/m2) | 15 | 2.19 | 13.61 | 1.45 | 14.07 | 1.77 | <0.001 | ||
| SBP (mmHg) | 108 | 18 | 104 | 14 | 106 | 16 | <0.001 | ||
| DBP (mmHg) | 65 | 11 | 67 | 11 | 66 | 12 | <0.001 | ||
BMI, body mass index; FM, fat mass; %BF, body fat percentage; FMI, fat mass index, calculated as FM in kilograms divided by stature in square meters (kg/m2); FFMI, fat free mass index, calculated as fat free mass in kilograms divided by stature in square meters (kg/m2). SBP, systolic blood pressure; DBP, diastolic blood pressure. IQR, Interquartile range.