Table 4.

Study designs.

	Number of studies	%
Experimental design a
Quasi-experimental	30	62.5%
Randomized controlled trial	15	31.3%
Natural experiment	3	6.3%
Type of intervention study a
Pilot/feasibility study	16	33.3%
Main trial	32	66.7%
Studies which included both	3	6.3%
Intervention evaluation methods b
Quantitative only	28	62.2%
Mixed methods	17	37.8%
Follow up beyond post-intervention a
No follow up	42	87.5%
1–3 months	2	4.2%
4–6 months	3	6.3%
> 6 months	1	2.1%
Additional evaluations
Reported intervention acceptability b	23	51.1%
Reported intervention feasibility b	25	55.6%
Reported cost effectiveness b	1	2.2%

^aPercentage calculated from the total number of included pilot/feasibility and main trials (N= 48). ^bPercentage calculated from the total number of included interventions (N = 45).