Table 1.
Demographic characteristics of Chinese school-aged children and adolescents 9–17 years old from the 2016 Physical Activity and Fitness in China—The Youth Study, (n (%) unless otherwise noted).
| Variable | Primary school | Junior middle school | Junior high school |
|---|---|---|---|
| Sample size (n) | 38,076 | 39,585 | 38,954 |
| Age (year, mean ± SD) | 10.28 ± 0.97 | 13.18 ± 1.16 | 15.94 ± 0.94 |
| Girl | 19,228 (50.5) | 20,030 (50.6) | 19,672 (50.5) |
| Ethnicity | |||
| Han | 31,679 (83.2) | 33,568 (84.8) | 32,527 (83.5) |
| Minority | 6397 (16.8) | 6017 (15.2) | 6427 (16.5) |
| Family income/person (RMB) | |||
| <9000 | 14,926 (39.2) | 15,636 (39.5) | 16,283 (41.8) |
| 9000–30,000 | 13,593 (35.7) | 14,290 (36.1) | 13,439 (34.5) |
| >30,000–100,000 | 7539 (19.8) | 7719 (19.5) | 7479 (19.2) |
| >100,000 | 2018 (5.3) | 1940 (4.9) | 1753 (4.5) |
| Family composition | |||
| Single child | 14,164 (37.2) | 15,082 (38.1) | 16,633 (42.7) |
| Two or more | 23,912 (62.8) | 24,503 (61.9) | 22,321 (57.3) |
| Residential setting | |||
| Urban | 20,066 (52.7) | 18,249 (46.1) | 18,308 (47.0) |
| Rural | 18,010 (47.3) | 21,336 (53.9) | 20,646 (53.0) |
| Parent education | |||
| Junior middle school or less | 18,086 (47.5) | 21,297 (53.8) | 19,126 (49.1) |
| Junior high school or some college | 12,603 (33.1) | 12,113 (30.6) | 13,751 (35.3) |
| Four-year college or more | 7387 (19.4) | 6175 (15.6) | 6077 (15.6) |
| BMI (kg/m2, mean ± SD) | 18.10 ± 3.35 | 19.78 ± 3.41 | 21.04 ± 3.25 |
Abbreviation: BMI = body mass index.