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Table 1 Characteristics of included trials

From: Do investigator meetings improve recruitment rates in clinical trials? A retrospective before-and-after study of data from nine multi-centre clinical trials

CharacteristicTrials (n = 9) (%)
Type of trial
 CTIMP3 (33%)
 Device1 (11%)
 Intervention5 (56%)
Stage of trial
 Definitive6 (67%)
 Feasibility3 (33%)
Funding type
 NIHR8 (89%)
 Industry1 (11%)
Clinical area
 Dermatology3 (33%)
 Diabetes1 (11%)
 Gastroenterology1 (11%)
 Hand surgery1 (11%)
 Pregnancy and childbirth2 (22%)
 Sexual health1 (11%)
Population
 Adults6 (67%)
 Paediatric2 (22%)
 Adults and paediatric1 (11%)
Sample size
 Mean (SD)549.6 (648.6)
 Median (IQR)269 (180, 517)
 Min, Max50, 1900
Length of recruitment (months)
 Mean (SD)23.6 (11.7)
 Median (IQR)22.4 (17.1, 26.1)
 Min, Max10.0, 44.4
Number of sitesa
 Mean (SD)13.9 (8.1)
 Median (IQR)16 (8, 22)
 Min, Max3, 25
  1. All data are N (%) unless otherwise stated
  2. CTIMP Clinical Trial of an Investigational Medicinal Product, IQR interquartile range, NIHR National Institute for Health Research (any programme)
  3. aOne trial was international and for this study only the UK sites are included