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Table 3 Intervention effect on screen-time behaviours 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 ICCc β [95 % CI] Pb ICCc β [95 % CI] Pb ICCc
TV on a weekday (min/day) −15.66 [−26.1, −5.22] 0.003 13.10 [2.00, 24.20] 0.02 0.08 −2.52 [−13.44, 8.68] 0.66 0.07 −7.84 [−17.92, 2.52] 0.14 0.08
TV on a weekend (min/day) −18.90 [−32.04, −5.58] 0.005 9.80 [−4.50, 24.10] 0.18 0.00 −10.36 [−23.8, 2.8] 0.12 0.00 −14.84 [−27.44, −2.52] 0.02 0.00
Video games on a weekday (min/day) −0.72 [−5.94, 4.32] 0.76 5.90 [−1.00, 12.80] 0.10 0.00 5.88 [−0.84, 12.6] 0.08 0.00 3.92 [−1.68, 9.52] 0.18 0.00
Video games on a weekend day (min/day) −1.80 [−10.44, 6.84] 0.68 0.30 [−9.20, 9.70] 0.96 0.01 −3.08 [−11.76, 5.6] 0.50 0.01 −2.80 [−10.64, 5.32] 0.52 0.01
Computer on a weekday (min/day) 1.80 [−8.64, 12.24] 0.74 3.10 [−8.10, 14.20] 0.59 0.08 3.92 [−8.4, 16.52] 0.52 0.06 4.48 [−7.84, 16.8] 0.48 0.07
Computer on a weekend day (min/day) −3.42 [−16.38, 9.54] 0.60 0.30 [−12.70, 13.30] 0.96 0.08 −6.44 [−20.72, 7.84] 0.37 0.07 −5.04 [−19.32, 8.96] 0.48 0.07
Total screen-time on a weekday (min/day) −14.22 [−30.78, 2.52] 0.10 21.40 [2.10, 40.70] 0.03 0.04 7.22 [−12.88, 27.44] 0.48 0.03 0.56 [−17.64, 19.04] 0.95 0.03
Total screen-time on a weekend day (min/day) −25.92 [−48.96, −3.06] 0.03 9.60 [−14.40, 33.60] 0.43 0.02 −22.42 [−47.04, 2.24] 0.07 0.02 −25.20 [−47.88, −2.8] 0.03 0.02
Proportion of adolescents who exceed 180 min/day on screen-time behaviours −0.04 [−0.09, 0.01] 0.01 0.00 [−0.05, 0.05] 0.98 0.00 −0.05 [−0.10, 0.00] 0.06 0.01 −0.06 [−0.10, −0.01] 0.01 0.00
  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 adjusted by adolescents’ BMI z-score, socio-economic status and gender
  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