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Table 2 Study design and methodological outcomes (n = 248)

From: Design, analysis, and reporting of pilot and feasibility trials in anesthesiology: a methodological study

Variable

Number (%)

Used qualitative dataa

24 (9.7)

 Participants

21 (8.5)

 Staff

7 (2.8)

Used progression criteria

27 (10.9)

Feasibility as primary objective

77 (31.0)

Feasibility as primary outcome

46 (18.6)

Feasibility outcomesa

 Enrolment

49 (19.8)

 Randomization

14 (5.6)

 Participation

4 (1.6)

 Retention

23 (9.3)

 Compliance

30 (12.1)

 Data completion

25 (10.1)

 Feedback

5 (2.0)

 Resources

2 (0.8)

 Blinding

3 (1.2)

 Timeliness of intervention

9 (3.6)

 Acceptability

7 (2.8)

 Adverse events

14 (5.6)

 Protocol fidelity

9 (3.6)

 None

182 (73.4)

 Other

15 (6.0)

Sample size justificationa

 Clinical outcome

91 (36.7)

 Feasibility outcome

24 (9.7)

 Literature (similar studies)

46 (18.6)

 No justification

114 (46.0)

 Other

4 (1.6)

  1. aThese categories are not mutually exclusive, so the sum of the counts may exceed 100%