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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