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Table 5 Cronbach’s α and average inter-item correlation coefficients assessed by Before-1 PDA scores (N = 93)

From: Reliability and validity of a questionnaire for self-assessment of complete dentures

Scales

Cronbach’s α

Average inter-item correlation coefficient

Summary score

0.91

0.59

Function

0.85

0.59

Aesthetics & speech

0.83

0.54

Lower denture

0.89

0.67

Expectation

0.93

0.83

Upper denture

0.86

0.67

Importance

0.56

0.28

  1. Before-1, questionnaire before replacement; PDA, Patient’s Denture Assessment.