Table 1 The characteristics of Chinese children and adolescents aged 7–17 years
Variables | Total (N = 30,486) | Boys (N = 15,869) | Girls (N = 14,617) | P value |
|---|---|---|---|---|
Residence area, N(%) | ||||
 Urban | 18,255(59.9) | 9557(60.2) | 8698(59.5) | 0.201 |
 Rural | 12,231(40.1) | 6312(39.8) | 5919(40.5) |  |
Age, years | 10.9 ± 3.1 | 10.8 ± 3.1 | 11.0 ± 3.1 | <0.001 |
Age group, N(%) | ||||
 6–9 | 12,252(40.2) | 6515(41.1) | 5737(39.2) | <0.001 |
 10–13 | 11,818(38.8) | 6159(38.8) | 5659(38.7) |  |
 14–17 | 6416(21.0) | 3195(20.1) | 3221(22.0) |  |
WC, cm | 65.4 ± 10.9 | 66.6 ± 11.7 | 64.1 ± 9.8 | <0.001 |
Height, cm | 146.6 ± 16.4 | 147.7 ± 17.8 | 145.5 ± 14.6 | <0.001 |
WHtR | 0.45 ± 0.05 | 0.45 ± 0.06 | 0.44 ± 0.05 | <0.001 |
Abdominal obesity, N (%) | 5006(16.4) | 3254(20.5) | 1752(12.0) | <0.001 |
Birth weight, g | 3324.4 ± 502.9 | 3366.8 ± 513.9 | 3278.5 ± 486.7 | <0.001 |
Birth weight group, N (%) | ||||
 <2500 | 943(3.1) | 460(2.9) | 483(3.3) | <0.001 |
 2500–2999 | 4057(13.3) | 1865(11.8) | 2192(15.0) |  |
 3000–3499 | 13,504(44.3) | 6649(41.9) | 6855(46.9) |  |
 3500–3999 | 8834(29.0) | 4949(31.2) | 3885(26.6) |  |
 ≥ 4000 | 3148(10.3) | 1946(12.3) | 1202(8.2) |  |
Gestational age, weeks | 39.8 ± 1.2 | 39.7 ± 1.3 | 39.8 ± 1.2 | <0.001 |
Fetus number, N (%) | ||||
 Singleton | 29,421(97.4) | 15,315(97.4) | 14,106(97.4) | 0.831 |
 Twins or more | 778(2.6) | 408(2.6) | 370(2.6) |  |
Breastfeeding, N (%) | ||||
 Breastfeeding | 257 98(85.2) | 13,371(84.9) | 12,427(85.6) | 0.075 |
Single child N (%) | 20,371(66.8) | 11,264(71.0) | 9107(62.3) | <0.001 |
Paternal overweight/obesity, N (%) | 15,052(49.4) | 7953(50.1) | 7099(48.6) | <0.001 |
Maternal overweight/obesity, N (%) | 7076(23.2) | 3632(22.9) | 3444(23.6) | 0.164 |
Paternal educational level, N (%) | ||||
 Junior high school or blew | 12,948(42.7) | 6780(43.0) | 6168(42.4) | 0.767 |
 Senior high school | 8468(27.9) | 4395(27.9) | 4073(28.0) |  |
 Junior college | 4465(14.7) | 2310(14.7) | 2155(14.8) |  |
 College or above | 4424(14.6) | 2282(14.5) | 2142(14.7) |  |
Maternal educational level, N (%) | ||||
 Junior high school or blew | 14,214(47.0) | 7454(47.4) | 6760(46.5) | 0.427 |
 Senior high school | 7940(26.2) | 4076(25.9) | 3864(26.6) |  |
 Junior college | 4462(14.7) | 2305(14.6) | 2157(14.9) |  |
 College or above | 3648(12.1) | 1904(12.1) | 1744(12.0) |  |
Daily fruit and vegetable consumption, servings | 3.2 ± 2.1 | 3.2 ± 2.1 | 3.2 ± 2.0 | 0.638 |
Daily SSBs consumption, servings | 0.4 ± 0.7 | 0.5 ± 0.8 | 0.3 ± 0.6 | <0.001 |
Daily meat consumption, servings | 1.2 ± 1.2 | 1.3 ± 1.3 | 1.0 ± 1.0 | <0.001 |
Daily moderate to vigorous physical activity duration, hours | 0.7 ± 1.0 | 0.8 ± 1.1 | 0.7 ± 1.0 | <0.001 |