Table 4.
Unadjusted models for intervention effect on screen-time per intervention stage and the whole intervention period
| Screen-time | Intervention effect after first intervention stage (0 to 18 months)a | Intervention effect after second intervention stage (18 to 28 months)a | Intervention effect considering baseline and last follow-up measurementsd | Overall intervention effect considering three measurementse | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| β [95 % CI] | Pb | β [95 % CI] | Pb | ICC c | β [95 % CI] | Pb | ICC c | β [95 % CI] | Pb | ICC c | |
| TV on a weekday (min/day) | −14.81 [−25.09, −4.52] | 0.005 | 11.96 [1.08, 22.84] | 0.03 | 0.08 | −3.00 [−13.72, 16.35] | 0.58 | 0.07 | −7.84 [−17.95, 2.27] | 0.13 | 0.08 |
| TV on a weekend (min/day) | −18.32 [−31.45, −5.18] | 0.006 | 9.93 [−6.2, 26.06] | 0.23 | 0.00 | −10.22 [−23.24, 3.44] | 0.12 | 0.00 | −15.15 [−27.33, −2.97] | 0.02 | 0.00 |
| Video games on a weekday (min/day) | −1.89 [−7.07, 3.28] | 0.47 | 5.96 [−0.77, 12.68] | 0.08 | 0.03 | 5.068 [−1.68, 3.95] | 0.14 | 0.03 | 2.80 [−3.22, 8.79] | 0.36 | 0.03 |
| Video games on a weekend day (min/day) | −6.08 [−14.89, 2.72] | 0.18 | 1.51 [−7.79, 10.81] | 0.75 | 0.04 | −5.18 [−14.28, 7.42] | 0.27 | 0.04 | −6.50 [−15.01, 2.04] | 0.13 | 0.05 |
| Computer on a weekday (min/day) | 2.52 [−7.85, 12.89] | 0.63 | 2.16 [−8.89, 13.21] | 0.70 | 0.09 | 3.00 [−9.24, 17.67] | 0.63 | 0.07 | 4.48 [−7.78, 16.74] | 0.48 | 0.08 |
| Computer on a weekend day (min/day) | −4.19 [−17.03, 8.64] | 0.52 | 0.73 [−12.14, 13.6] | 0.91 | 0.09 | −6.50 [−20.72, 10.30] | 0.37 | 0.08 | −5.38 [−19.43, 8.65] | 0.45 | 0.08 |
| Total screen-time on a weekday (min/day) | −13.45 [−29.81, 2.92] | 0.11 | 19.3 [0.4, 38.21] | 0.05 | 0.04 | 5.15 [−14.56, 17.02] | 0.61 | 0.03 | −0.64 [−18.68, 17.39] | 0.94 | 0.03 |
| Total screen-time on a weekend day (min/day) | −30.42 [−53.17, −7.69] | 0.01 | 11.97 [−11.54, 35.47] | 0.32 | 0.02 | −23.24 [−47.60, 1.74] | 0.06 | 0.02 | −28.42 [−50.74, −6.10] | 0.01 | 0.02 |
| Proportion of adolescents who exceed 180 min/day on screen-time behaviours | −0.05 [−0.18, 1.10] | 0.06 | 0.00 [−0.1, 0.0] | 0.90 | 0.01 | −0.06 [0.0, 0.0] | 0.02 | 0.02 | −0.06 [0.0, 0.0] | 0.004 | 0.01 |
TV Television
aThe spline regression was used to assess the effect of intervention effect over the time. The knot was the mean time for the first follow-up (18 months)
bThe models were not adjusted
cIntracluster correlation coefficient
dThe multilevel modeling included the measurements at baseline and follow-up at 28 months
eThe multilevel modeling included the measurements at baseline, follow-up at 18 months and follow-up at 28 months