Published 2017-03-01
“…Many trials fail to reach their planned sample size within the envisaged trial timescale and trial funding envelope.Objectives To review the consent, recruitment and retention rates for single and multicentre randomised control trials funded and published by the UK's
National Institute for Health Research (NIHR) Health Technology Assessment (HTA) Programme.Data sources and study selection HTA reports of individually randomised single or multicentre RCTs published from the start of 2004 to the end of April 2016 were reviewed.Data extraction Information was extracted, relating to the trial characteristics, sample size, recruitment and retention by two independent reviewers.Main outcome measures Target sample size and whether it was achieved; recruitment rates (number of participants recruited per centre per month) and retention rates (randomised participants retained and assessed with valid primary outcome data).Results This review identified 151 individually RCTs from 787 NIHR HTA reports. …”
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