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Table 3 Median sample sizes per arm of pilot and feasibility studies by endpoint and funder

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

   Sample size per arm
n Median (IQR) [Range]
Pilot Industry Dichotomous 5 25 (25, 30) [10, 90]
Continuous 6 23 (15, 31) [8, 100]
Public Dichotomous 6 36 (30, 42) [20, 60]
Continuous 21 30 (20, 60) [15, 114]
Feasibility Industry Dichotomous 0 . .
Continuous 1 30 .
Public Dichotomous 9 50 (30, 70) [25, 300]
Continuous 6 43 (15, 60) [10, 60]