Table 1

Duration of the intervention and outcome measurement of included studies

Reference, country	Intervention period	Pre-intervention measurement period	Intervention measurement period	Post-intervention measurement period (time to commencement after intervention ceased)
m, month(s); wk, week(s).
RCTs
Meischke et al, 1997,¹⁶ USA	7 wk+10 m	None	10 m	14 m
Luepker et al, 2000,¹⁷ USA	18 m	4 m	18 m	None
Controlled trial
Rowley et al, 1982,¹⁵ England	32 m	3 m	32 m	None
Before and after studies
Mitic and Perkins, 1984,¹² Canada	8 wk	4 wk	8 wk	1 wk (3 m)
Ho et al, 1989,¹⁰ USA	2 m	4.5 m	None	4.5 m
Moses et al, 1991,¹³ USA	24 m	12 m	24 m	None
Rustige et al, 1992,¹⁴ Germany	9 m (1st period)	6 m	9 m	6 m (after 1st period)
	18 m (2nd period)			18 m (ongoing with 2nd period)
Bett et al, 1993,⁷ Australia	1 wk	2 m	None	1 m (1 m)
Blohm et al, 1994,⁸ Sweden	14 m	21 m	14 m	36 m
Gaspoz et al, 1996,⁹ Switzerland	12 m	12 m	12 m	None
Maeso-Madronero et al, 2000,¹¹ Germany	6 m	6 m	6 m	None