Characteristics of participants | Total screen time at baseline | Total screen time at T2 | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
 | Girls | Boys | Girls | Boys | ||||||||
 | M* | SD* | p | M* | SD* | p | M* | SD* | p | M* | SD* | p |
Self-efficacy related to barriers to physical activity | ||||||||||||
   Low | 19.56 | 11.10 | 0.02 | 24.46 | 12.07 | < 0.001 | 25.01 | 11.68 | 0.001 | 27.39 | 13.17 | < 0.001 |
   High | 16.96 | 10.39 |  | 17.19 | 9.50 |  | 21.13 | 10.58 |  | 20.82 | 11.19 |  |
Parental regulation of screen time | ||||||||||||
   Low | 19.89 | 11.71 | 0.13 | 22.31 | 12.01 | 0.32 | 24.49 | 11.99 | 0.24 | 26.33 | 13.67 | 0.02 |
   High | 17.96 | 10.57 |  | 21.10 | 11.46 |  | 22.94 | 11.11 |  | 23.38 | 12.25 |  |
BMI status | ||||||||||||
   Non-overweight | 17.88 | 10.30 | 0.04 | 20.81 | 11.18 | < 0.001 | 22.84 | 11.09 | 0.08 | 23.88 | 12.41 | 0.07 |
   Overweight/obese | 20.93 | 12.79 |  | 27.01 | 14.25 |  | 25.82 | 12.20 |  | 27.40 | 14.13 |  |
Pubertal stage | ||||||||||||
   Pre-pubertal | 16.47 | 10.30 | 0.40 | 21.61 | 10.30 | 0.74 | 20.88 | 10.29 | 0.29 | 22.68 | 12.22 | 0.32 |
   Early pupertal | 19.30 | 11.49 |  | 21.07 | 11.57 |  | 24.15 | 11.40 |  | 24.74 | 12.56 |  |
   Mid/late/post-pubertal | 18.44 | 10.65 |  | 20.28 | 12.46 |  | 23.56 | 11.50 |  | 24.17 | 12.46 |  |
Ethnicity | ||||||||||||
   Norwegian | 17.79 | 10.10 | < 0.001 | 21.65 | 11.78 | 0.87 | 23.10 | 11.14 | 0.25 | 24.37 | 12.76 | 0.78 |
   Ethnic Minority | 26.43 | 14.77 |  | 22.04 | 12.21 |  | 25.60 | 13.62 |  | 23.65 | 12.71 |  |
Parental education | ||||||||||||
   Low | 18.88 | 12.16 | 0.51 | 22.85 | 13.44 | 0.23 | 25.18 | 11.71 | 0.03 | 25.74 | 13.70 | 0.20 |
   Medium | 18.98 | 10.02 |  | 20.59 | 10.60 |  | 23.42 | 11.71 |  | 24.01 | 12.03 |  |
   High | 17.59 | 10.72 |  | 21.05 | 10.84 |  | 21.52 | 10.43 |  | 23.06 | 12.54 |  |
Living status | ||||||||||||
   Married or cohabitating parents | 18.72 | 10.74 | 0.26 | 20.83 | 11.56 | 0.003 | 23.17 | 11.32 | 0.62 | 23.26 | 12.13 | 0.001 |
   Other | 17.13 | 11.64 |  | 24.97 | 12.45 |  | 23.89 | 11.47 |  | 28.15 | 14.30 |  |