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Table 1 Characteristics of included studies

From: The reporting of progression criteria in protocols of pilot trials designed to assess the feasibility of main trials is insufficient: a meta-epidemiological study

Variable Number (%)
Overall 227 (100)
Journal
PAFS* 42 (18.5)
BMJ Open** 71 (31.1)
Trials 114 (50.2)
Year of publication
 2013 34 (15.0)
 2014 37 (16.3)
 2015 34 (15.0)
 2016 50 (22.0)
 2017 72 (31.7)
Region
 North America 43 (18.9)
 Europe 120 (52.9)
 Other 64 (28.2)
Funding
 Industry 52 (24.5)
 Government or private 160 (75.5)
Intervention type
 Pharmacological 35 (15.4)
 Non-pharmacological 191 (84.1)
Feasibility outcomes (yes) 123 (54.2)
Sample size reported (yes) 220 (96.9)
Sample size
 Small (n = 0–60) 143 (64.7)
 Large (n > 60) 78 (35.3)
Sample size justification
 Adequate 99 (44.8)
 Inadequate 122 (55.2)
  1. *Pilot and Feasibility Studies
  2. **British Medical Journal