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Table 3 Weighted kappa coefficients for stability of daily TV and VG time between ages 5, 8, 11, and 13

From: Tracking of TV and video gaming during childhood: Iowa Bone Development Study

  Age 5-8 Age 5-11 Age 5-13 Age 8-11 Age 8-13 Age 11-13
  (n = 193 boys, 222 girls) (n = 171 boys, 211 girls) (n = 168 boys, 189 girls) (n = 161 boys, 205 girls) (n = 158 boys, 185 girls) (n = 152 boys, 180 girls)
TV Viewing       
   Boys 0.29** (0.20, 0.38) 0.12* (0.02, 0.22) 0.17* (0.07, 0.27) 0.19* (0.09, 0.28) 0.22** (0.12, 0.32) 0.24** (0.13, 0.36)
   Girls 0.34** (0.25, 0.42) 0.21** (0.11, 0.30) 0.09* (-0.01, 0.19) 0.30** (0.22, 0.39) 0.20* (0.11, 0.30) 0.17* (0.07, 0.26)
Video Gaming       
   Boys 0.14* (0.02, 0.26) 0.05* (-0.01, 0.10) 0.01* (-0.04, 0.07) 0.10* (0.01, 0.19) 0.11* (0.04, 0.19) 0.13* (0.02, 0.25)
   Girls 0.34** (0.17, 0.51) 0.09* (0.00, 0.17) 0.08* (-0.01, 0.18) 0.22** (0.11, 0.32) 0.02* (-0.05, 0.10) 0.18* (0.08, 0.29)
  1. Presented as kappa (95% confidence interval)
  2. Landis and Koch (1977) proposed classifications for the interpretation of a weighted kappa value. * slight; ** fair.