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Table 1 The BrQ domains and the results of tests of item convergent validity, item consistency reliability and floor and ceiling effects for each domain of the BrQ

From: Development and preliminary validation of Brace Questionnaire (BrQ): a new instrument for measuring quality of life of brace treated scoliotics

BrQ Domains

Number of items

Item convergent validitya

Internal consistency reliabilityb

Floor effectsc

Ceiling effectsd

General health perception

2

100%

0.72

0 (0.0%)

1 (3.6%)

Physical functioning

7

100%

0.80

0 (0.0%)

0 (0.0%)

Emotional functioning

5

100%

0.77

0 (0.0%)

0 (0.0%)

Self esteem and aesthetics

2

100%

0.88

0 (0.0%)

0 (0.0%)

Vitality

2

100%

0.84

0 (0.0%)

0 (0.0%)

School activity

3

100%

0.82

0 (0.0%)

3 (10.7%)

Bodily pain

6

100%

0.85

0 (0.0%)

2 (7.1%)

Social functioning

7

100%

0.88

0 (0.0%)

3 (10.7%)

  1. a Percentage of item-scale correlations ≥ 0.40.
  2. b Cronbach's alpha coefficient
  3. c Percentage of respondents with minimum scale scores
  4. d Percentage of respondents with maximum scale scores