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A greater number of items also has the additional benefit of increasing test reliability.
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The scores in some items also have significant gender difference.
These items also had a 4-point Likert scale with possible response options ranging from 1 = serious problem to 4 = not a problem.
Easy items also have low discrimination.
Quality items also had no significant influence on diagnostic characteristics.
Quantitatively, these items also had poor discriminant validity.
Individual items also had good test-retest reliability (range of kappa coefficients, 0.54 to 0.85).
These two items also had the highest and lowest scores of 4.35 and 2.39 respectively.
The overall score, which includes all items, also had high consistency (Cronbach's alpha = 0.88).
These items also had a communality of 0.15, 0.21 and 0.21, respectively.
These self-developed items also had to be answered on a 5-point ordinal scale to what extent they agreed.
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