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Table 6 Outcomes of the mixed multilevel regression models for dependent variable physical activity (in counts per minute; CPM), sedentary behavior (%), light physical activity (%), and moderate to vigorous physical activity (%)a

From: Strength exercises during physical education classes in secondary schools improve body composition: a cluster randomized controlled trial

 

Physical Activity (CPM)

Physical Activity

Physical Activity

Physical Activity

 

Sedentary %

Light %

Moderate to Vigorous %

Estimate

95% CI

Estimate

95% CI

Estimate

95% CI

Estimate

95% CI

 

M (SE)

M (SE)

M (SE)

M (SE)

M (SE)

M (SE)

M (SE)

M (SE)

Intercept

807.34 (58.28)***

692–923

72.32 (1.70)

68.9–75.7

23.25 (0.68)***

21.7–24.8

3.25 (0.38)***

2.5–4.0

Timeb

− 63.22 (18.31)***

−99 – − 27

1.71 (0.56)

0.6–2.8

−1.52 (0.50)**

−2.5 – − 0.5

− 0.16 (0.13)

−0.4 –0.1

Conditionb

− 8.91(40.95)

−107 – 88

0.16 (1.26)

−2.8 – 3.2

0.03 (0.91)

−2.2 – 2.2

−0.14 (0.24)

− 0.7 –0.4

Age

Sexb

66.46 (16.99)***

33–100

−0.97 (0.49)

− 1.8 – − 0.0

0.45 (0.11)***

0.2–0.7

Level of education

−2.20 (1.07)

− 4.8 – 0.4

BMI baseline

−7.98 (2.48)***

−13 – 3

0.15 (0.07)

0.0–0.3

− 0.06 (0.02)***

−0.1 – − 0.0

Time*Condition

50.99 (25.75)*

0–100

−0.29 (0.78)

−1.8 – 1.3

− 0.15 (0.70)

− 1.5 – 1.2

0.38 (0.19)*

0.0–0.8

  1. Intraclass correlations (all between 0.01–0.10
  2. *p < .05; **p < .01; ***p < .001
  3. a The variables ‘Switch’, ‘Time*Switch’ (Footnote a), “Time*Sex’, ‘Time*BMI baseline’ and ‘Time*Level of education” were in the initial model. As these were not significant, these are excluded in the clean model as described in the table
  4. b Coding: Time (0 = T0, 1 = T1), Condition (0 = Control condition, 1 = Intervention condition), Sex (0 = girls, 1 = boys