Table 4. ISAT reliability of scores summarizing components of the school environment.
| School grounds factor or subscale | Mean (s.d.) (n=256)a | ICC (95% CI) (n=33)b | ICC (95% CI) (n=20)c |
|---|---|---|---|
| Walking provision (6 items) | 3.9 (1.5) | 0.75 (0.56, 0.87) | 0.73 (0.38, 0.90) |
| Cycling provision (9 items) | 4.2 (2.0) | 0.83 (0.69, 0.91) | 0.87 (0.66, 0.95) |
| Sports and play facilities (8 items) | 4.3 (1.7) | 0.86 (0.74, 0.93) | 0.82 (0.55, 0.93) |
| Other facility provision (5 items) | 2.5 (1.4) | 0.97 (0.94, 0.98) | 0.93 (0.81, 0.98) |
| Aesthetics (6 items) | 3.1 (1.1) | 0.46 (0.15, 0.69) | 0.88 (0.69, 0.96) |
| Suitability of school grounds (3 items) | 2.7 (0.7) | 0.35 (0.02, 0.61) | 1.00 |
Abbreviations: CI, confidence interval; ICC, intraclass correlation coefficient; ISAT, ISCOLE school audit tool; ISCOLE, International Study of Childhood Obesity, Lifestyle and the Environment.
a
Mean (s.d.) of component scores across entire ISCOLE school sample.
b
Reliability of component scores within the sample of reliability schools from two ISCOLE sites that performed reliability audits on the majority of schools in the sample.
c
Reliability of component scores within the sample of reliability schools from ten ISCOLE sites that performed reliability audits on two schools within each site-specific sample.