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Table 3 Factors associated with progression criteria usage, feasibility as the primary outcome, and feasibility outcome for sample size justification

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

Variable

Use of progression criteria

Primary feasibility outcome

Sample size based on feasibility

OR (95% CI)

p

OR (95% CI)

p

OR (95% CI)

p

Publication year

1.26 (0.90–1.74)

0.174

1.39 (1.06–1.83)

0.017

1.51 (1.06–2.15)

0.023

Impact factor

1.01 (0.96–1.06)

0.717

0.98 (0.92–1.04)

0.433

0.93 (0.81–1.07)

0.324

Funding

 Industry

1 (Ref.)

 

1 (Ref.)

 

1 (Ref.)

 

 Public or private

1.69 (0.51–5.63)

0.395

1.34 (0.51–3.47)

0.552

1.17 (0.34–4.04)

0.803

 No reported funding

0.31 (0.06–1.59)

0.162

0.33 (0.1–1.07)

0.066

0.47 (0.11–2.03)

0.313

Intervention type

 Non-pharmacological

1 (Ref.)

 

1 (Ref.)

 

1 (Ref.)

 

 Pharmacological

0.51 (0.2–1.3)

0.159

0.41 (0.19–0.9)

0.025

0.95 (0.38–2.36)

0.908

WHO region

 Americas

1 (Ref.)

 

1 (Ref.)

 

1 (Ref.)

 

 E. Mediterranean

0.99 (0.11–9.3)

0.996

0.42 (0.05–3.74)

0.440

0.94 (0.10–8.54)

0.955

 Europe

1.30 (0.46–3.67)

0.614

1.28 (0.56–2.96)

0.557

1.21 (0.40–3.67)

0.733

 South-East Asia

0.80 (0.09–7.48)

0.846

0.32 (0.04–2.81)

0.301

0.53 (0.06–4.85)

0.577

 Western Pacific

0.99 (0.3–3.24)

0.983

0.74 (0.28–1.94)

0.540

1.00 (0.30–3.26)

0.995

AIC

169.8

223.5

155.7

  1. AIC Akaike's Information Criterion, WHO World Health Organisation, OR Odds Ratio, CI Confidence Intervals