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

Special effort or projects in physical activity^a

79 (71%)

0.05 (0.03–0.09)

0.11 (0.09–0.15)

Gym hall suitable for sports^b

102 (88%)

0.05 (0.02–0.13)

0.12 (0.08–0.17)

Good selection of sports equipment^c

105 (90%)

0.04 (0.01–0.14)

0.11 (0.07–0.17)

Good changing and shower facilities^c

85 (73%)

0.04 (0.02–0.08)

0.11 (0.08–0.14)

Good access to outdoor football fields^c

101 (86%)

0.08 (0.03–0.15)

0.14 (0.09–0.20)

Offers physical activity outside of school hours^d

109 (72%)

0.04 (0.01–0.11)

0.10 (0.07–0.15)