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The self-reported AAQoL was included after protocol amendment 1 (July 8 , 2010 that deleted the Sheehan Disability Scale; hence not all study participants completed the AAQoL scale.
When the coefficient increases after an item is deleted from the scale, one can assume that the item is not correlated highly with other items in the scale.
Thus, 25 of items were deleted from the scale.
These items were deleted from the scale as they did not sufficiently differentiate respondents (Table 1).
None of the 25 items would increase the alpha coefficient if deleted from the scale (Table 5).
The Cronbach's alpha decreased when any one item was deleted from the scale except for the items of emotion and schoolwork.
One item about using alcohol to cope craving of heroin had to be deleted from the scale due to low factor loading and low item-total correlation.
Of the original 30 items, one item, concerning sleeping away from home, was deleted from the scale as it detracted from scale reliability and factor structure, and was not applicable to the great majority of respondents.
Items which did not load on any factors (factor loading < 0.4) or loaded on more than one factor with factor loadings > 0.4, [ 40] were deleted from the scale and the EFA was rerun with the reduced set of items.
An estimation of Cronbach's alpha if an item were to be deleted from the scale was used to identify which items affected the questionnaire's internal consistency the most.
On the basis of early frequency, reliability and forced 1-factor analyses, 3 domain items (fertility, finances and depend) were deleted from the scale for the following reasons: Severe non-normality of distributions (fertility; finances; depend).
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