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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)

From: Participation in organised sports does not slow declines in physical activity during adolescence

 

Model for organised physical activity at school

Model for organised physical activity in the community

Model for any organised physical activity

Variable

Difference a, b

95% CI

Difference a, b

95% CI

Difference a, 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)

  1. 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.