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Table 4 Intra-class correlation coefficient (ICC) with 95% confidence intervals (CI) for school-level factors and physical activity at school during leisure time

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

  Schools with the facility/initiative School Class + school
  n (%) ICC (95% CI) ICC (95% CI)
Special effort or projects in physical activitya 79 (71%) 0.05 (0.03–0.09) 0.11 (0.09–0.15)
Gym hall suitable for sportsb 102 (88%) 0.05 (0.02–0.13) 0.12 (0.08–0.17)
Good selection of sports equipmentc 105 (90%) 0.04 (0.01–0.14) 0.11 (0.07–0.17)
Good changing and shower facilitiesc 85 (73%) 0.04 (0.02–0.08) 0.11 (0.08–0.14)
Good access to outdoor football fieldsc 101 (86%) 0.08 (0.03–0.15) 0.14 (0.09–0.20)
Offers physical activity outside of school hoursd 109 (72%) 0.04 (0.01–0.11) 0.10 (0.07–0.15)
  1. Abbreviations: CI confidence interval, ICC Intra-class correlation coefficient
  2. All variables are adjusted for age and sex. n denotes the proportion of schools reporting having or providing the school facility or initiative
  3. acontain answers from 99 schools with students in 2655 classes
  4. bcontain answers from 114 schools with students in 3064 classes
  5. ccontain answers from 115 schools with students in 3104 classes
  6. dcontain answers from 113 schools with students in 3055 classes