Table 1 Standardized characteristics of primary 4 and primary 6 students by academic year
From: Increasing socioeconomic disparities in sedentary behaviors in Chinese children
Characteristics (%) | 1999/2000 (N = 93,027) | 2000/01 (N = 98,137) | 2001/02 (N = 106,228) | 2002/03 (N = 106,832) | 2003/04 (N = 115,628) | 2004/05 (N = 115,498) | 2005/06 (N = 114,335) | 2006/07 (N = 111,645) | 2007/08 (N = 97,955) | 2008/09 (N = 89,309) |
|---|---|---|---|---|---|---|---|---|---|---|
Grade | ||||||||||
 P4 | 50.4 | 51.3 | 51.3 | 50.9 | 50.7 | 50.9 | 50.4 | 51.1 | 49.9 | 49.3 |
 P6 | 49.6 | 48.7 | 48.7 | 49.1 | 49.3 | 49.1 | 49.6 | 48.9 | 50.1 | 50.7 |
Sex | ||||||||||
 Girls | 48.5 | 48.6 | 48.5 | 48.2 | 48.4 | 48.3 | 48.3 | 48.4 | 48.6 | 48.5 |
 Boys | 51.5 | 51.4 | 51.5 | 51.8 | 51.6 | 51.7 | 51.7 | 51.6 | 51.4 | 51.5 |
Highest parental education | ||||||||||
 Tertiary | 9.7 | 10.3 | 10.9 | 11.8 | 12.8 | 14.3 | 15.5 | 16.9 | 18.5 | 19.7 |
 Secondary | 70.7 | 70.3 | 70.5 | 70.1 | 71.0 | 71.2 | 71.6 | 72.0 | 71.7 | 71.6 |
 Primary/below | 19.7 | 19.4 | 18.6 | 18.1 | 16.3 | 14.6 | 12.9 | 11.0 | 9.9 | 8.7 |
Highest parental occupation | ||||||||||
 Managerial/professional | 21.5 | 21.3 | 21.3 | 21.1 | 21.8 | 22.4 | 23.5 | 23.5 | 24.3 | 24.4 |
 Clerical/service industry | 29.8 | 30.4 | 31.2 | 32.0 | 33.8 | 35.1 | 36.8 | 38.6 | 39.6 | 40.9 |
 Manual job | 44.4 | 43.5 | 42.2 | 41.2 | 38.6 | 36.7 | 33.9 | 32.2 | 30.9 | 29.6 |
 Unemployed | 4.4 | 4.8 | 5.3 | 5.7 | 5.9 | 5.8 | 5.8 | 5.7 | 5.3 | 5.1 |
Weight status | ||||||||||
 Underweight | 15.5 | 15.5 | 15.7 | 14.4 | 14.0 | 14.1 | 14.0 | 13.4 | 12.3 | 11.3 |
 Normal | 64.6 | 64.5 | 64.7 | 65.1 | 65.6 | 65.4 | 64.6 | 64.5 | 64.1 | 64.1 |
 Overweight | 16.2 | 16.2 | 16.0 | 16.5 | 16.4 | 16.5 | 17.1 | 17.7 | 18.6 | 19.2 |
 Obesity | 3.7 | 3.8 | 3.6 | 4.0 | 4.1 | 4.0 | 4.3 | 4.4 | 5.0 | 5.3 |
 Age of P4 (Mean ± SD) | 9.5 ± 0.49 | 9.5 ± 0.51 | 9.5 ± 0.50 | 9.5 ± 0.49 | 9.4 ± 0.47 | 9.4 ± 0.46 | 9.4 ± 0.46 | 9.4 ± 0.47 | 9.4 ± 0.49 | 9.4 ± 0.50 |
 Age of P6 (Mean ± SD) | 11.5 ± 0.56 | 11.5 ± 0.57 | 11.5 ± 0.57 | 11.5 ± 0.57 | 11.5 ± 0.55 | 11.5 ± 0.53 | 11.5 ± 0.50 | 11.5 ± 0.49 | 11.5 ± 0.49 | 11.5 ± 0.49 |