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Table 4 Psychometric validation of the PACT-Q2 dimensions for the 3 population subsets

From: Scoring and psychometric validation of the Perception of Anticoagulant Treatment Questionnaire (PACT-Q©)

Population subsets Cronbach's alpha Floor effectc (%) Ceiling effectd (%) Convergent and discriminant validity criterion
(range of item-scale correlations)
"scoring and initial validation" (n = 452)
    Convenience 0.83 0 21.2 0.31–0.63
    Anticoagulant Treatment Satisfaction 0.79 0.6 4.0 0.36–0.66
"robustness" (n = 200)
    Convenience 0.87 0 24.1 0.40–0.67
    Anticoagulant Treatment Satisfaction 0.70 0 1.9 0.26–0.59
"pooled" (n = 652)
    Convenience 0.84 0 22.1 0.33–0.64a
    Anticoagulant Treatment Satisfaction 0.76 0.4 3.3 0.33–0.63b
  1. a except items B10 and B11, all items meet the convergent validity criterion
  2. b except items D2 and D3, all items meet the convergent validity criterion
  3. c percentage of patients with the lowest possible score (i.e. 0), that is patients who answered the least favourable response choice to all items of the dimension.
  4. d percentage of patients with the highest possible score (i.e. 100), that is patients who answered the most favourable response choice to all items of the dimension.