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Table 1 Trial characteristics of the studies included in the final analysis

From: An audit of sample sizes for pilot and feasibility trials being undertaken in the United Kingdom registered in the United Kingdom Clinical Research Network database

  Description of preliminary study
  Pilot   Feasibility   Both   Total
n (%) n (%) n (%) n (%)
Number of arms Two 39 78.0 25 100.0 4 100.0 68 86.1
Three 10 20.0 0 0.0 0 0.0 10 12.7
Four 1 2.0 0 0.0 0 0.0 1 1.3
Type of trial Health technology 34 68.0 23 92.0 3 75.0 60 75.9
Drug 16 32.0 2 8.0 1 25.0 19 24.1
Disease area Stroke 4 8.0 1 4.0 0 0.0 5 6.3
Mental health 11 22.0 6 24.0 1 25.0 18 22.8
Oncology 4 8.0 4 16.0 0 0.0 8 10.1
Respiratory 3 6.0 1 4.0 0 0.0 4 5.1
Oral & Gastrointestinal 3 6.0 2 8.0 0 0.0 5 6.3
Dementias 3 6.0 1 4.0 0 0.0 4 5.1
Cardiovascular 2 4.0 2 8.0 1 25.0 5 6.3
Primary care 5 10.0 2 8.0 0 0.0 7 8.9
Musculoskeletal 4 8.0 1 4.0 0 0.0 5 6.3
Other 11 22.0 5 20.0 2 50.0 18 22.8
Type of end point Dichotomous 15 30.0 12 48.0 4 100.0 31 39.2
Continuous 35 70.0 10 40.0 0 0.0 45 57.0
Time-to-event 0 0.0 1 4.0 0 0.0 1 1.3
Other 0 0.0 2 8.0 0 0.0 2 2.5
Funder Industry 11 22.0 1 4.0 1 25.0 13 16.5
Public 27 54.0 17 68.0 3 75.0 47 59.5
Charity 12 24.0 7 28.0 0 0.0 19 24.1