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Table 3 Results of multilevel model analysis on the intervention on children's recess VPA (% of total recess)

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

Parameter Model 1 Model 2
  β (SE) 95%CI p β (SE) 95%CI p
Constant 4.63 (0.77) 3.12 to 6.14 <0.001** 9.69 (3.18) 3.46 to 15.92 0.002**
Baseline VPA 0.41 (0.07) 0.27 to 0.55 <0.001** 0.35 (0.07) 0.21 to 0.49 <0.001**
Intervention 1.70 (0.86) 0.01 to 3.39 0.049* 1.30 (0.79) -0.24 to 2.84 0.098
Sex NE    -3.05 (0.66) -4.34 to -1.76 <0.001**
Age NE    -0.09 (0.27) -0.62 to 0.44 0.74
BMI NE    -0.21 (0.12) -0.45 to 0.03 0.08
Recess duration NE    0.01 (0.02) -0.03 to 0.05 0.617
Random       
School Level 1.19 (1.21)    0.74 (0.95)   
Child Level 28.48 (2.72)    23.4 (2.32)   
Deviance 1511.756    1347.832   
  1. Abbreviations: VPA = 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.