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Table 4 Reported intra-cluster correlation coefficients for primary outcomes (N = 8)

From: Systematic review of the characteristics of school-based feasibility cluster randomised trials of interventions for improving the health of pupils in the UK

Author (Year) Cluster unit Health area Outcome Outcome type ICC (95% CI)
Jago (2012) [36] Schools Physical activity MVPA (minutes per weekday) Continuous 0.018 (< 0.001 to 0.087)
Jago (2014) [37] Schools Physical activity MVPA (minutes per weekday) Continuous 0.0653 (0.00091 to 0.12977)
Kipping (2008) [39] Schools Physical activity and nutrition Minutes spent on screen-based activities Continuous 0.01 (0 to 0.03)
Lloyd (2012) [40] Schools Physical activity and nutrition BMI SD score Continuous 0.04 (0 to 0.15)
Sahota (2019) [45] Schools Physical activity and nutrition Healthy nutrition and physical activity knowledge Continuous 0.07 (Not provided)
Sebire (2018) [46] Schools Physical activity MVPA (minutes per weekday) Continuous  < 0.0001 (0.0 to 0.03)
Segrott (2015) [47] Schools Alcohol misuse Drinking initiation Binary 0.112 (Not provided)
White (2017) [49] Schools Illicit drug misuse Lifetime illicit drug use Binary 0.003 (Not provided)
  1. BMI Body mass index, CI Confidence interval, ICC Intra-cluster correlation coefficient, MVPA Moderate to vigorous physical activity, SD Standard deviation