Table 1. Demographic characteristics, anthropometric indices and cardiometabolic risk factors in the studied sample.
| Total (n = 15698) |
Boys (n = 8004) |
Girls (n = 7694) |
P^ | |
|---|---|---|---|---|
| Demographic variables, mean ± SD or n (%) | ||||
| Age (years) | 11.08±3.29 | 11.08±3.25 | 11.09±3.34 | 0.801 |
| Ethnicity | 0.916 | |||
| Han | 14697 (93.6) | 7492 (93.6) | 7205 (93.6) | |
| Minorities | 1001 (6.4) | 512 (6.4) | 489 (6.4) | |
| Region | <0.001 | |||
| Hunan | 2116 (13.5) | 1188 (14.8) | 928 (12.1) | |
| Ningxia | 2013 (12.8) | 983 (12.3) | 1030 (13.4) | |
| Tianjin | 2683 (17.1) | 1314 (16.4) | 1369 (17.8) | |
| Chongqing | 2113 (13.5) | 1065 (13.3) | 1048 (13.6) | |
| Liaoning | 2257 (14.4) | 1157 (14.5) | 1100 (14.3) | |
| Shanghai | 2165 (13.8) | 1108 (13.8) | 1057 (13.7) | |
| Guangzhou | 2351 (15.0) | 1189 (14.9) | 1162 (15.1) | |
| Home location | 0.104 | |||
| Urban | 9489 (60.4) | 4888 (61.1) | 4601 (59.8) | |
| Rural | 6209 (39.6) | 3116 (38.9) | 3093 (40.2) | |
| BMI categories | <0.001 | |||
| Normal group | 11383 (72.5) | 5575 (69.7) | 5808 (75.5) | |
| Overweight group | 2465 (15.7) | 1288 (16.1) | 1177 (15.3) | |
| Obese group | 1850 (11.8) | 1141 (14.3) | 709 (9.2) | |
| Anthropometric indices, median (quartile) | ||||
| BMI percentile | 60.64 (32.64–86.86) | 57.14 (29.81–87.29) | 63.31 (35.57–86.43) | <0.001 |
| WC percentile | 65.54 (40.52–87.08) | 61.79 (37.45–86.21) | 68.79 (44.04–87.70) | <0.001 |
| waist-height ratio | 0.43 (0.41–0.47) | 0.43 (0.41–0.48) | 0.43 (0.41–0.46) | <0.001 |
| waist-hip ratio | 0.84 (0.80–0.88) | 0.85 (0.81–0.89) | 0.83 (0.79–0.87) | <0.001 |
| Cardiometabolic variables, median (quartile) | ||||
| FPG (mmol/L) | 4.72 (4.39–5.03) | 4.78 (4.43–5.09) | 4.66 (4.34–4.96) | <0.001 |
| TC (mmol/L) | 3.92 (3.47–4.41) | 3.86 (3.41–4.35) | 3.99 (3.55–4.45) | <0.001 |
| nHDL (mmol/L) | 2.55 (2.16–2.99) | 2.49 (2.11–2.93) | 2.61 (2.23–3.04) | <0.001 |
| LDL (mmol/L) | 2.02 (1.68–2.43) | 1.99 (1.63–2.41) | 2.07 (1.71–2.46) | <0.001 |
| HDL (mmol/L) | 1.34 (1.14–1.56) | 1.33 (1.13–1.55) | 1.35 (1.15–1.56) | 0.001 |
| TG (mmol/L) | 0.82 (0.63–1.08) | 0.78 (0.60–1.04) | 0.86 (0.67–1.13) | <0.001 |
| SBP (mmHg) | 102.00 (96.00–110.00) | 105.00 (98.00–114.00) | 101.00 (94.00–110.00) | <0.001 |
| DBP (mmHg) | 65.00 (60.00–71.00) | 66.00 (60.00–71.00) | 64.00 (60.00–70.00) | <0.001 |
| Cardiometabolic risk factors, n (%) | ||||
| IFG | 460 (2.9) | 328 (4.1) | 132 (1.7) | <0.001 |
| High TC | 863 (5.5) | 401 (5.0) | 462 (6.0) | 0.006 |
| High nHDL | 835 (5.3) | 401 (5.0) | 434 (5.6) | 0.078 |
| High LDL | 483 (3.1) | 227 (2.8) | 256 (3.3) | 0.075 |
| Low HDL | 2285 (14.6) | 1262 (15.8) | 1023 (13.3) | <0.001 |
| High TG | 2020 (12.9) | 915 (11.4) | 1105 (14.4) | <0.001 |
| High SBP | 1141 (7.3) | 615 (7.7) | 526 (6.8) | 0.041 |
| High DBP | 1026 (6.5) | 540 (6.7) | 486 (6.3) | 0.276 |
| Dyslipidemia | 4284 (27.3) | 2147 (26.8) | 2137 (27.8) | 0.181 |
| Hypertension | 1655 (10.5) | 879 (11.0) | 776 (10.1) | 0.068 |
| Cluster of risk factors | 889 (5.7) | 454 (5.7) | 435 (5.7) | 0.960 |
^P values for the comparisons of these variables between boys and girls.