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Table 4 The association between physical activity time and CDI value* among urban junior high-school students in Nanjing, China, using linear regression models

From: Physical activity inversely associated with the presence of depression among urban adolescents in regional China

   Gender School Grade
  Total Girls Boys 7 8 9
Model 1 #       
   B -0.033 -0.051 -0.029 -0.015 -0.027 -0.057
   SE 0.005 0.010 0.006 0.009 0.013 0.021
   R2 0.005 0.007 0.006 0.002 0.002 0.009
   p-value 0.000 0.000 0.000 0.101 0.045 0.005
   DF 1 1 1 1 1 1
Model 2 §       
   B -0.030 -0.046 -0.024 -0.011 -0.024 -0.050
   SE 0.005 0.015 0.006 0.008 0.012 0.010
   R2 0.011 0.013 0.008 0.006 0.009 0.012
   p-value 0.000 0.002 0.000 0.186 0.040 0.000
   DF 15 14 14 14 14 14
  1. *Time spent in physical activity and CDI were both considered as continuous variables, with CDI as the dependent variable.
  2. B: unstandardized coefficient; SE: standard error.
  3. # Model 1: regression coefficient calculated via univariate linear regression model.
  4. § Model 2: regression coefficient calculated via multivariate linear regression model with adjustment for age, gender, school grade, BMI, TV time, study time, sleep time, smoking behavior, alcohol consumption, unintentional injuries, parents' educational attainments, parents' job statuses, and family structure.