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Table 7 Internal Consistency of OES Sp by questions (Q).Cronbach’s Alpha in different times (Baseline = 0.883; one week = 0.944 and;one month = 0.918)

From: The effects of at-home whitening on patients’ oral health, psychology, and aesthetic perception

Items

Media of the scale if the item is deleted

Variance of the scale if the item is deleted

Correlation item-total corrected

Cronbach’s Alpha if the item is deleted

BASELINE

 8

45.52

120.605

0.524

0.880

 Q2

45.86

124.717

0.363

0.895

 Q3

46.38

102.485

0.827

0.849

 Q4

46.71

102.667

0.813

0.851

 Q5

46.36

109.814

0.729

0.861

 Q6

47.93

112.592

0.581

0.876

 Q7

46.31

112.358

0.582

0.876

 Q8

46.05

111.138

0.831

0.854

ONE WEEK RECALL

 Q1

49.47

118.499

.593

.900

 Q2

49.74

123.353

.395

.916

 Q3

50.02

103.561

.838

.878

 Q4

50.24

98.958

.867

.875

 Q5

50.16

102.590

.814

.880

 Q6

50.29

108.527

.707

.891

 Q7

49.52

118.675

.565

.903

 Q8

49.69

112.393

.805

.885

ONE MONTH RECALL

 Q1

52.09

84.483

.708

.910

 Q2

52.46

84.071

.511

.929

 Q3

52.43

76.940

.888

.894

 Q4

52.63

78.675

.843

.898

 Q5

52.59

79.628

.750

.906

 Q6

52.52

84.945

.610

.917

 Q7

52.34

81.283

.737

.907

 Q8

52.20

81.761

.867

.899