Table 2.
Model for organised physical activity at school | Model for organised physical activity in the community | Model for any organised physical activity | ||||
Variable | Differencea, b | 95% CI | Differencea, b | 95% CI | Differencea, b | 95% CI |
Organised physical activity | ||||||
No | Reference | Reference | Reference | |||
Yes | ↑ 16% | 6, 26% | ↑ 46% | 31, 63% | ↑ 42% | 27, 59% |
Time (survey cycle)c | ↓ 3% | -3, -2% | ↓ 3% | -4, -2% | ↓ 2% | -3, -1% |
Interaction terms | ||||||
Time × No | Reference | Reference | Reference | |||
Time × Yes | ↔ | -1, 1% | ↔ | -1, 1% | ↓ 1% | -2, 0% |
Age at baseline (years) | ↓ 1% | -8, 7% | ↔ | -7, 8% | ↔ | -7, 7% |
Sex (female) | ↓ 25% | -30, -19% | ↓ 24% | -29, -18% | ↓ 24% | -30, -19% |
Season | ||||||
Fall | Reference | Reference | Reference | |||
Winter | ↓ 13% | -15, -11% | ↓ 13% | -15, -11% | ↓ 13% | -15, -11% |
Spring | ↑ 10% | 7, 12% | ↑ 10% | 7, 12% | ↑ 10% | 7, 12% |
Intercept (95% CI) | 25.8 (9.6, 69.4) | 17.1 (6.3, 46.3) | 18.3 (6.7, 49.6) |
CI, confidence interval; a Also adjusted for school;b Percent difference in number of moderate or vigorous physical activity sessions per week derived from Poisson regression rate ratio. Alternatively, the percent difference for participation in organised physical activity at school (category "Yes" in model for school physical activity) can be interpreted as a rate ratio of 1.16 with 95% CI = 1.06 to 1.26. c Time unit is the 3-month interval between survey cycles; ↑, increase; ↓, decrease; ↔, no effect.