Skip to main content

Table 2 Median sample size per arm according to type of study, funder and endpoint

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]
Trial description Pilot 50 30 (20, 45) [8, 114]
Feasibility 25 36 (25, 50) [10, 300]
Both 4 49 (36, 61) [23, 72]
Type of endpoint Dichotomous 31 36 (25, 50) [10, 300]
Continuous 45 30 (20, 50) [8, 114]
Funder Industry 13 30 (16, 31) [8, 100]
Public 47 36 (25, 60) [10, 300]
Charity 19 30 (20, 45) [15, 52]