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Table 5 Grouping of the items in the scale components, their factor loadings (Cronbach’s alpha), internal consistency, indexes of reliability, convergent and discriminant validity obtained by means of the exploratory factor analysis

From: Reliability and validity of measuring scale for postoperative complications in third molar surgery

Components Composite Alpha Extracted variance Interobserver Reliabilitya Item Standb Var. Error Factor loadingc Convergent validityd Discriminant validity
Component 1 0.79 0.56 84.9 Inflammation 0.59 0.65 0.59 4.64 0.50
Edema 0.74 0.45 0.74 6.11
Pain 0.89 0.21 0.81 6.68
Component 2 0.71 0.55 87.9 Abscess 0.71 0.49 0.78 5.24
Alveolar osteitis 0.78 0.39 0.78 5.74
  1. aIntraclass correlation > 80%
  2. bFor selecting the item, the stand must be greater than the extracted variance of each component
  3. cCronbach’s alpha > 0.7
  4. dFactor loading with statistical significance student’s t > 1.96