Findings

What do systematic reviews say?

1 questions · 1 findings · 1 reviews

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No studies found 0 · 0%GRADE not reported 0 · 0%Very low 1 · 100%Low 0 · 0%Moderate 0 · 0%High 0 · 0%

Data collection location and method: telephone follow‐up vs postal questionnaire

Retention [ · trial participants being followed up for data collection

It is very uncertain whether data collection location and method: telephone follow‐up changes retention [ compared with postal questionnaire (very low certainty).

1 finding from 1 review

Strategies to improve retention in randomised trials 2021 · Cochrane Headline outcomes only
RR 1.04 [0.94, 1.17]
2 studies · 1006 participants
Very low