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Table 1 Characteristics of the study population from 1997 to 2006: China Health and Nutrition Surveys

From: Temporal trends and recent correlates in sedentary behaviours in Chinese children

  Survey year
  1997 2000 2004 2006
n 2469 1838 1382 1128
Age (yrs, mean ± SD)** 11.7 ± 3.1 12.0 ± 2.9 12.0 ± 3.2 11.7 ± 3.2
Male (%) 52.5 54.0 52.6 53.1
Urban (%) 29.6 29.4 29.4 28.9
Per capita family annual income (RMB § , mean ± SD)   
   Urban** 4389 ± 3090 5806 ± 4957 6980 ± 6368 8453 ± 8570
   Rural*** 3178 ± 2605 3728 ± 3042 4799 ± 4781 5187 ± 7820
Prevalence of screen time ≥ 2 hrs/d (%, Urban)   
   Boys aged 6-12 yrs* 13.3 16.4 31.7 36.7
   Boys aged 13-18 yrs*** 11.2 11.1 42.9 44.3
   Girls aged 6-12 yrs*** 13.5 11.3 33.7 27.2
   Girls aged 13-18 yrs*** 9.7 8.5 25.3 34.7
Prevalence of screen time ≥ 2 hrs/d (%, Rural)   
   Boys aged 6-12 yrs*** 9.4 11.5 30.3 46.7
   Boys aged 13-18 yrs*** 5.7 7.6 22.9 32.5
   Girls aged 6-12 yrs*** 10.2 11.6 28.4 42.3
   Girls aged 13-18 yrs*** 3.0 8.3 16.7 24.6
  1. *P < 0.01. **P < 0.001. ***P < 0.0001.
  2. § RMB denotes Chinese currency.
  3. The per capita family annual income in each survey year was inflated to values in 2009 by adjusting for consumer price index.