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Table 3 Trends in the influence of urbanisation on waist circumference of adolescents aged 12–18 years, the CHNS 1991 to 2011ab

From: Trends in urban/rural inequalities in cardiovascular risk bio-markers among Chinese adolescents in two decades of urbanisation: 1991–2011

  Model 1 Model 2 Model 3
Coefficient 95%CI Coefficient 95%CI Coefficient 95%CI
Boy
Year 0.267*** (0.204, 0.330) 0.240*** (0.173, 0.308) 0.266** (0.081, 0.451)
Index    0.029* (0.004, 0.055) 0.941 (−5.147, 7.029)
Year*Index      −0.0005 (−0.003, 0.003)
Girl
Year 0.177*** (0.119, 0.236) 0.175*** (0.113, 0.237) −0.081 (− 0.253, 0.091)
Index    0.005 (−0.018, 0.028) −9.024** (−14.656, −3.391)
Year*Index      0.005** (0.002, 0.007)
  1. *P < 0.05; ** P < 0.01; *** P < 0.001
  2. aCHNS China Health and Nutrition Survey, CI confidence interval
  3. bAll models adjusted for age (centred on 12 years), quadratic term of age, maternal education (completed years of formal education in regular school) and log transformation of per capita household income