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. 2009 Mar 31;6:22. doi: 10.1186/1479-5868-6-22

Table 2.

Adjusted percent difference in number of moderate or vigorous physical activity sessions per week according to participation in organised physical activities (n = 1028)

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.