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Table 3 Intra-class correlation coefficient (ICC) and 95% confidence interval (CI) for measures of physical activity

From: School and class-level variations and patterns of physical activity: a multilevel analysis of Danish high school students

  School Class School + Class
  ICC 95% CI ICC 95% CI ICC 95% CI
Inactive during leisure time (n = 67,417) 0.03 (0.02–0.04) 0.06 (0.05–0.06) 0.08 (0.07–0.09)
Very active during leisure time (n = 69,121) 0.03 (0.02–0.04) 0.06 (0.05–0.06) 0.09 (0.08–0.10)
Organised physical activity (n = 63,986) 0.04 (0.03–0.06) 0.06 (0.06–0.06) 0.10 (0.09–0.12)
Self-organised physical activity (n = 63,986) 0.01 (0.01–0.02) 0.02 (0.02–0.03) 0.04 (0.03–0.04)
Physically active at school during leisure time (n = 63,986) 0.09 (0.06–0.11) 0.06 (0.06–0.06) 0.15 (0.12–0.17)
Active transportation (n = 69,070) 0.08 (0.07–0.11) 0.04 (0.04–0.04) 0.12 (0.10–0.14)
  1. Abbreviations: CI confidence interval, ICC Intra-class correlation coefficient, PA physical activity
  2. Inactive during leisure time, organised PA, self-organised PA and PA at school during leisure time contain answers from students from 117 schools and 3147 classes. Answers for very active during leisure time and active transportation are provided by students from 119 schools and 3213 classes
  3. All variables are age and sex adjusted