Values of kappa (Κ) (95% confidence interval) and percentage agreement (A) (95% confidence interval) for test-retest reliability for year 8 and year 10 boys and girls for the frequency of participation question, the duration of participation question, and for responses to the two questions categorised into two categories of participation
| Year 8 | Year 10 | |||
|---|---|---|---|---|
| Boys (n=63) | Girls (n=58) | Boys (n=75) | Girls (n=30) | |
| *Weighted kappa. | ||||
| †Unweighted kappa. | ||||
| Frequency | Κ=0.36 (0.20 to 0.51)* | Κ=0.44 (0.25 to 0.64)* | Κ=0.60 (0.48 to 0.72)* | Κ=0.57 (0.34 to 0.80)* |
| A=41% (29 to 54) | A=56% (42 to 69) | A=57% (45 to 69) | A=59% (39 to 77) | |
| Duration | Κ=0.22 (0.05 to 0.39)* | Κ=0.26 (0.09 to 0.44)* | Κ=0.58 (0.47 to 0.70)* | Κ=0.52 (0.29 to 0.75)* |
| A=35% (23 to 48) | A=28% (17 to 41) | A=44% (33.56) | A=50% (31 to 69) | |
| Two categories | Κ=0.12 (0.00 to 0.38)† | Κ=0.25 (0.00 to 0.52)† | Κ=0.70 (0.54 to 0.86)† | Κ=0.38 (0.04 to 0.71)† |
| A=67% (54 to 79) | A=70% (56 to 81) | A=85% (75 to 92) | A=70% (51 to 85) | |