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Table 4 Unadjusted models for intervention effect on screen-time per intervention stage and the whole intervention period

From: School-based intervention on healthy behaviour among Ecuadorian adolescents: effect of a cluster-randomized controlled trial on screen-time

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
  1. TV Television
  2. 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)
  3. bThe models were not adjusted
  4. cIntracluster correlation coefficient
  5. dThe multilevel modeling included the measurements at baseline and follow-up at 28 months
  6. eThe multilevel modeling included the measurements at baseline, follow-up at 18 months and follow-up at 28 months