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Table 2 Logistic regression analyses of factors associated with the experience of depressive symptoms

From: Assessment of life factors affecting the experience of depressive symptoms in adolescents: a secondary analysis using the Korea Youth Risk Behavior Survey

Variables Unadjusted model Adjusted modela
OR 95% Cl for OR p-value OR 95% Cl for OR p-value
Gender
 Boys 1        
 Girls 1.879 1.802 1.959  < 0.001 1.998 1.881 2.122  < 0.001
School grade
 Middle 1st grade 1     1    
 Middle 2nd grade 1.305 1.213 1.404  < 0.001 1.123 1.038 1.215  < 0.01
 Middle 3rd grade 1.368 1.273 1.470  < 0.001 1.098 1.015 1.188  < 0.05
 High 1st grade 1.286 1.195 1.384  < 0.001 0.924 0.849 1.006 0.067
 High 2nd grade 1.378 1.280 1.483  < 0.001 0.867 0.795 0.945  < 0.01
 High 3rd grade 1.492 1.389 1.604  < 0.001 0.886 0.812 0.966  < 0.01
Perceived health status
 Very healthy 1     1    
 Healthy 1.429 1.352 1.511  < 0.001 1.377 1.297 1.463  < 0.001
 Normal 2.326 2.189 2.473  < 0.001 2.115 1.975 2.264  < 0.001
 Unhealthy 3.897 3.577 4.247  < 0.001 3.406 3.095 3.748  < 0.001
 Very unhealthy 6.393 4.740 8.623  < 0.001 6.198 4.474 8.585  < 0.001
Dietary behaviorb
 None 1     1    
 1 day 1.145 1.049 1.248  < 0.01 1.086 0.989 1.193 0.086
 2 days 1.020 0.939 1.107 0.645 0.992 0.908 1.085 0.866
 3 days 1.007 0.925 1.095 0.880 0.970 0.886 1.063 0.514
 4 days 0.983 0.898 1.076 0.711 0.975 0.884 1.075 0.608
 5 days 0.904 0.837 0.977  < 0.05 0.948 0.872 1.031 0.213
 6 days 0.820 0.751 0.894  < 0.001 0.895 0.815 0.983  < 0.05
 7 days 0.671 0.632 0.712  < 0.001 0.793 0.742 0.847  < 0.001
Physical activityc
 None 1     1    
 1 day 1.136 1.067 1.209  < 0.001 1.212 1.133 1.297  < 0.001
 2 days 1.007 0.945 1.073 0.836 1.181 1.102 1.265  < 0.001
 3 days 1.014 0.948 1.085 0.682 1.297 1.203 1.398  < 0.001
 4 days 0.943 0.864 1.030 0.193 1.292 1.173 1.425  < 0.001
 5 days 0.951 0.869 1.040 0.271 1.328 1.201 1.467  < 0.001
 6 days 0.985 0.856 1.134 0.837 1.446 1.241 1.685  < 0.001
 7 days 1.054 0.965 1.151 0.244 1.625 1.469 1.797  < 0.001
Time spent studying (WDd)
 360–479 min 1     1    
 < 240 min 0.990 0.920 1.065 0.777 1.149 1.062 1.243  < 0.01
 240–359 min 1.079 0.986 1.182 0.100 1.194 1.083 1.316  < 0.001
 480–599 min 1.022 0.949 1.101 0.565 1.015 0.937 1.099 0.715
 600–719 min 1.077 0.999 1.161 0.052 1.062 0.978 1.154 0.153
 > 720 min 1.178 1.095 1.268  < 0.001 1.125 1.033 1.226  < 0.01
Time spent studying (WKe)
 None 1     1    
 1–119 min 0.876 0.812 0.944  < 0.001 1.014 0.934 1.100 0.743
 120–239 min 0.928 0.864 0.996  < 0.05 1.102 1.018 1.193  < 0.05
 240–359 min 0.991 0.919 1.070 0.824 1.217 1.116 1.327  < 0.001
 360–479 min 0.985 0.901 1.077 0.744 1.267 1.144 1.404  < 0.001
 > 480 min 1.121 1.039 1.210  < 0.01 1.518 1.380 1.670  < 0.001
Duration of internet use (WDd)
 None 1     1    
 1–60 min 0.885 0.834 0.940  < 0.001 1.025 0.949 1.107 0.531
 61–120 min 0.954 0.897 1.014 0.134 1.057 0.974 1.147 0.184
 121–180 min 1.057 0.987 1.132 0.115 1.042 0.950 1.144 0.381
 > 180 min 1.344 1.259 1.434  < 0.001 1.174 1.068 1.292  < 0.05
Duration of internet use (WKe)
 None 1     1    
 1–60 min 0.799 0.739 0.865  < 0.001 0.866 0.788 0.952  < 0.01
 61–120 min 0.818 0.761 0.879  < 0.001 0.895 0.819 0.979  < 0.05
 121–180 min 0.817 0.762 0.877  < 0.001 0.894 0.817 0.979  < 0.05
 > 180 min 1.000 0.947 1.057 0.993 0.929 0.854 1.010  < 0.01
  1. CI confidence interval, OR odds ratio
  2. aAdjusted model for all variables except multicultural family and city type
  3. bDietary behavior: Number of days per week on which participants ate breakfast
  4. cPhysical activity: Number of days per week participants engaged in physical activity for at least 60 min per day
  5. dWD: weekday
  6. eWK: weekend