Table 1 Characteristics of subjects. |
| Variables |
Boys, Mean (±SD)
(n = 38,152) |
Girls, Mean (±SD)
(n = 34,247) |
Total, Mean (±SD)
(n = 72,399) |
| Age (years) |
015.00 ± 1.73 |
015.12 ± 1.77 |
015.06 ± 1.75 |
| Height (m) |
1.70 ± .08 |
1.60 ± .05 |
1.65 ± .08 |
| Weight (kg) |
060.14 ± 11.72 |
051.47 ± 7.67 |
056.04 ± 10.91 |
| BMI (kg·m-2) |
020.80 ± 3.21 |
020.05 ± 2.58 |
020.45 ± 2.95 |
| Weight state |
Boys, N (%) |
Girls, N (%) |
Total, N (%) |
| Underweight (BMI < 18.5) |
09719 (25.5) |
10012 (29.2) |
19731 (27.3) |
| Normal weight (18.5 ≤ BMI < 23) |
19685 (51.6) |
19655 (57.4) |
39340 (54.3) |
| Overweight (23 ≤ BMI < 25) |
04382 (11.5) |
02967 (8.7) |
07349 (10.2) |
| Obesity (25 ≤ BMI) |
04366 (11.4) |
01613 (4.7) |
05979 (08.3) |
| Family economic state |
Boys, N (%) |
Girls N (%) |
Total, N (%) |
| High |
02691 (07.1) |
01337, (03.9) |
04028 (05.6) |
| Middle high |
08768 (23.0) |
06719 (19.6) |
15487 (21.4) |
| Average |
17229 (45.2) |
17259 (50.4) |
34488 (47.6) |
| Middle low |
06890 (18.1) |
06825 (19.9) |
13715 (18.9) |
| Low |
02574 (06.7) |
02107 (06.2) |
04681 (06.5) |
| City size |
Boys, N (%) |
Girls, N (%) |
Total, N (%) |
| Large |
20252 (53.1) |
17708 (51.7) |
37960 (52.4) |
| Middle |
13303 (34.9) |
12153 (35.5) |
25456 (35.2) |
| Small |
04597 (12.0) |
04386 (12.8) |
08983 (12.4) |
| Grade |
Boys, N (%) |
Girls, N (%) |
Total, N (%) |
| Middle 1st |
06711 (17.6) |
05615 (16.4) |
12326 (17.0) |
| Middle 2nd |
06722 (17.6) |
05727 (16.7) |
12449 (17.2) |
| Middle 3rd |
06767 (17.7) |
05615 (16.4) |
12382 (17.1) |
| High 1st |
06626 (17.4) |
05369 (15.7) |
11995 (16.6) |
| High 2nd |
05889 (15.4) |
06102 (17.8) |
11991 (16.6) |
| High 3rd |
05437 (14.3) |
05819 (17.0) |
11256 (15.5) |
| PE class frequency |
Boys, N (%) |
Girls, N (%) |
Total, N (%) |
| No class per week |
02961 (7.8) |
03815 (11.1) |
06776 (9.4) |
| 1 PE class per week |
03064 (8.0) |
03236 (9.4) |
06300 (8.7) |
| 2 PE classes per week |
18479 (48.4) |
15738 (46.0) |
34217 (47.2) |
| ≥ 3 PE classes per week |
13648 (35.8) |
11458 (33.5) |
25106 (34.7) |
|
BMI, Body Mass Index; PE, Physical education[M1]. |
|