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Table 1 Characteristics of included interventions (n = 50)

From: A systematic review and meta-analysis of the overall effects of school-based obesity prevention interventions and effect differences by intervention components

Category

N

%

Study design

 Cluster RCT

47

94.0

 RCT

3

6.0

Duration of interventions, months

 3–12

32

64.0

  > 12

18

36.0

Types of schools

 Elementary

43

86.0

 Secondary

6

12.0

 Mixed

1

2.0

Income level of country

 High-income

40

80

 Middle income

10

20

Types of interventions

 Single-component (n = 15)

  PA

7

3.5

  HE

7

3.5

  SP

1

2.0

 Multi-component (n = 35)

  PA + SP

2

3.9

  HE+SP

5

9.8

  PA + HE+/−SP

10

19.6

  PA + DI+/−SP

3

5.9

  HE+DI+/−SP

7

13.7

  PA + HE+DI+/−SP

8

15.7

  1. RCT randomized controlled trial, PA physical activity, HE health education, DI dietary improvement, SP school policy; “+/−”: with or without