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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