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Table 4 Presentation of the results of the primary analyses in a 2 × 2 factorial trial[3]

From: Design, analysis and presentation of factorial randomised controlled trials

 

Decision Analysis n = 100

no Decision Analysis n = 112

Video/leaflet n = 104

no Video/leaflet n = 108

Total Decisional Conflict, mean (SD)

27.6 (12.1)

38.9 (18.3)

30.3 (13.4)

36.8 (18.8)

Adjusted difference1,2 (95% CI)

-9.4 (-13.0 to -5.8)3

 

-4.2 (-7.8 to -0.6)3

 

p value

< 0.001

 

0.021

 
  1. 1 Adjusted for age, sex, decisional conflict at baseline, factorial design and general practice (all comparisons are for the intervention compared with its respective control) 2 Negative differences represent a favourable outcome for the relevant intervention 3 The interaction between the interventions was investigated as a secondary analysis and was found to be significant (interaction coefficient = 12 (95% CI 5 to 19), p = 0.001)