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The AAQ-II has strong psychometric properties with a mean alpha coefficient of.84.
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In the sample of Achenbach et al. [ 2] the mean Cronbach's alpha coefficient of the DSM-oriented scales of the YSR was.76 and the test retest reliability.79.79
Although we studied the reliability of the 11-item WOMAC-SF by means of the Cronbach alpha coefficient to measure the internal consistency, the reliability study should be complemented with a test-retest study.
Moreover, the analysis of internal consistency by means of the Cronbach's alpha coefficient showed that removal of any subtest would involve a decrease in this coefficient, which supports the relevance of each of them.
A summative composite scale was formed with a factor analysis identifying one single factor (% variance explained = 54.63%; Cronbach's alpha coefficient = 0.631, mean = 10.9 ± 1.8, range = 4-12).
The sum of 19 item scores was converted into a total score (Cronbach's alpha coefficient = 0.71; mean = 5.3 ± 2.1; range = 0-19).
The internal consistency of the anxiety stigma items was calculated using the Cronbach alpha coefficient and the factor structure by means of a Principal Components Analysis.
The Cronbach alpha coefficient of the scale was 0.88, the mean score was 82.5, and the standard deviation 17.5.
The item-total correlations, alpha coefficient and homogeneity coefficient (inter-item correlation mean and range; Table 3) provide evidence towards the internal construct validity of PU-QOL scales.
Standard Error of measurement computed by multiplying the standard deviation at diagnosis by the square root of 1 - alpha (Cronbach alpha coefficient)/Δ = the difference between mean scores at diagnosis and month 6.
In the present study, the multiplicative coefficient was fixed to 1, thus providing a mean alpha risk <5%.
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