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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]

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BMC Medical Research Methodology

ISSN: 1471-2288

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