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Table 2 Results of multilevel model analysis on the intervention on children's recess MVPA (% of total recess)

From: Children's physical activity levels during school recess: a quasi-experimental intervention study

  Model 1 Model 2
  β (SE) 95%CI p β (SE) 95%CI p
Constant 14.20 (3.04) 8.24 to 20.16 <0.001** 23.88 (9.22) 5.81 to 41.94 0.009**
Baseline MVPA 0.49 (0.07) 0.36 to 0.62 <0.001** 0.37 (0.07) 0.24 to 0.49 <0.001**
Intervention 5.95 (2.97) 0.14 to 11.77 0.045* 4.5 (2.83) -1.05 to 10.1 0.112
Sex NE    -7.15 (1.42) -9.94 to -4.36 <0.001**
Age NE    -0.13 (0.62) -1.34 to 1.09 0.841
BMI NE    -0.55 (0.24) -1.03 to -0.07 0.024*
Recess duration NE    0.10 (0.07) -0.04 to 0.24 0.147
Random       
School Level 40.15 (15.44)    35.45 (13.8)   
Child Level 125.17 (12)    99.10 (9.93)   
Deviance 1889.766    1698.943   
  1. Abbreviations: MVPA = Moderate-to-Vigorous Physical Activity; CI = Confidence Interval; β = Regression coefficient; SE = Standard Error; NE = Not entered.
  2. Model 1 is the crude analysis, where the intervention effect is controlled for baseline physical activity. For the intervention variable, the control group is the reference category). Model 2 is the adjusted analysis, where the effect of the intervention is corrected for sex (boy is the reference category), BMI, age and recess time. * P < 0.05; **P < 0.01.