Table 1 Characteristics of study participants
Characteristics | Boys (N = 21,463) | Girls (N = 21,282) | P for comparison |
|---|---|---|---|
Age (year) | 11.1(3.1) | 11.5(3.2) | < 0.001 |
Weight (kg) | 42.4(16.7) | 39.8(13.6) | < 0.001 |
Height (cm) | 146.7(17.6%) | 145.1(14.8%) | < 0.001 |
Body mass index (kg/m2) | 18.9(4.0) | 18.3(3.6) | < 0.001 |
Systolic blood pressure (mmHg) | 106.0(12.5) | 103.3(11.6) | < 0.001 |
Diastolic blood pressure (mmHg) | 66.8(8.8) | 65.9(8.5) | < 0.001 |
Hypertension | 2927(13.6%) | 2727(12.8%) | 0.01 |
Outdoor exercise | < 0.001 | ||
< 1 h/day | 8333(38.8%) | 9548(44.9%) | |
1–2 h/day | 8144(37.9%) | 7629(35.8%) | |
≥ 2 h/day | 4986(23.2%) | 4105(19.3%) | |
Fruit intake | < 0.001 | ||
≤ 3 days/week | 6431(30.0%) | 5031(23.6%) | |
4–6 days/week | 6533(30.4%) | 6770(31.8%) | |
Daily | 8944(39.9%) | 9481(44.5%) | |
Vegetable intake | < 0.001 | ||
≤ 3 days/week | 2773(12.9%) | 2485(11.7%) | |
4–6 days/week | 3515(16.4%) | 3354(15.8%) | |
Daily | 15,175(70.7%) | 15,443(72.6%) | |
Parental smoking | 10,668(49.7%) | 10,684(50.2%) | 0.30 |
Parental hypertension | 1434(6.7%) | 1565(7.4%) | 0.007 |
Maternal educational attainment | 0.08 | ||
Primary school or illiterate | 2143(10.0%) | 2068(9.7%) | |
Secondary school | 8173(38.1%) | 7899(37.1%) | |
High school | 5534(25.8%) | 5638(26.5%) | |
College/university or above | 5613(26.2%) | 5677(26.7%) |