Findings

What do systematic reviews say?

67 questions · 67 findings · 8 reviews · Methodology

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No studies found 15 · 22.4%GRADE not reported 0 · 0%Very low 22 · 32.8%Low 19 · 28.4%Moderate 8 · 11.9%High 3 · 4.5%

Brief participant information leaflet (PIL) vs usual PIL

Number recruited · individuals eligible for a trial

Brief participant information leaflet (PIL) showed no clear difference in number recruited compared with usual PIL (moderate certainty).

1 finding from 1 review

Strategies to improve recruitment to randomised trials 2018 · Cochrane Headline outcomes only
RR 1 [0.93, 1.07]
2 studies · 4633 participants
Moderate

Participant information leaflet (PIL) developed with feedback from users vs usual PIL

Number recruited · individuals eligible for a trial

Participant information leaflet (PIL) developed with feedback from… showed no clear difference in number recruited compared with usual PIL (moderate certainty).

1 finding from 1 review

Strategies to improve recruitment to randomised trials 2018 · Cochrane Headline outcomes only
RR 1.09 [0.96, 1.25]
2 studies · 16763 participants
Moderate

Providing information by video vs by standard means alone

Number recruited · individuals eligible for a trial

It is very uncertain whether providing information by video changes number recruited compared with by standard means alone (very low certainty).

1 finding from 1 review

Strategies to improve recruitment to randomised trials 2018 · Cochrane Headline outcomes only
RR 1.08 [0.89, 1.31]
3 studies · 4695 participants
Very low

Financial incentive vs no incentives

Number recruited · individuals eligible for a trial

Financial incentive showed no clear difference in number recruited compared with no incentive (moderate certainty).

1 finding from 1 review

Strategies to improve recruitment to randomised trials 2018 · Cochrane Headline outcomes only
RR 1.48 [0.85, 2.58]
6 studies · 1506 participants
Moderate

Industry sponsored vs non‐industry sponsored studies

Number of studies with favorable efficacy results · industry sponsorship and study results

1 finding from 1 review

Industry sponsorship and research outcome 2017 · Cochrane Headline outcomes only
no estimate extracted
25 studies · 2923 participants
Moderate

Industry sponsored vs non‐industry sponsored studies

Number of studies with favorable harms results · industry sponsorship and study results

1 finding from 1 review

Industry sponsorship and research outcome 2017 · Cochrane Headline outcomes only
no estimate extracted
4 studies · 826 participants
Very low

Industry sponsored vs non‐industry sponsored studies

Number of studies with favorable conclusions · industry sponsorship and study results

1 finding from 1 review

Industry sponsorship and research outcome 2017 · Cochrane Headline outcomes only
no estimate extracted
29 studies · 4583 participants
Low