Table 3

Quality assessment of the intervention studies according to the EPHPP tool*

	Component rating
Study	Representativeness	Design	Confounders	Blinding	Methods	Drop-outs	Global rating
Andersen et al31	Weak	Strong	Strong	Moderate	Strong	Moderate	Moderate
Bangsbo et al30	Weak	Strong	Strong	Moderate	Strong	Strong	Moderate
Carrasco et al33	Weak	Strong	Strong	Weak	Strong	Moderate	Weak
Helge et al32	Weak	Strong	Strong	Moderate	Strong	Moderate	Moderate
Knoepfli-L. et al23	Weak	Strong	Moderate	Moderate	Strong	Moderate	Moderate
Krustrup24	Weak	Strong	Strong	Weak	Strong	Strong	Weak
Krustrup et al25	Weak	Strong	Strong	Moderate	Strong	Moderate	Moderate
Krustrup et al26	Weak	Strong	Strong	Weak	Strong	Moderate	Weak
Krustrup et al28	Weak	Strong	Strong	Weak	Strong	Strong	Weak
Meyers and Vaquero34	Weak	Strong	Weak	Weak	Strong	Strong	Weak
Nybo et al37	Weak	Strong	Weak	Weak	Strong	Strong	Weak
Randers et al29	Weak	Strong	Strong	Moderate	Strong	Moderate	Moderate
Randers et al27	Weak	Strong	Strong	Weak	Strong	Weak	Weak

*Effective Public Health Practice Project,10 see details in the text.