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Table 3 Literature survey: Comparison of studies (n = 54) using the key words feasibility or pilot

From: What is a pilot or feasibility study? A review of current practice and editorial policy

Study components Pilot n = 20 Feasibility n = 34 Chi-squared1 P-value
Sample size 7 (35%) 3 (8%) 5.7 0.028
Hypothesis testing 14 (70%) 25 (74%) 0.78 0.51
Randomization 11 (55%) 8 (24%) 5.5 0.037
Blinding 3 (15%) 3 (9%) 0.48 0.39
Control group 13 (65%) 11 (32%) 5.4 0.020
Further study suggested 16 (80%) 15 (44%) 6.6 0.012
Number of participants Median (IQR) [Range] 62.5 (31, 189) [8, 187777] 125.5 (36, 1005) [5, 12774614] -1.04* 0.29
  1. 1 1 degree of freedom
  2. * z-statistic (Mann-Whitney test)