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A low item missing rate indicates that it is feasible to apply the instrument in Iran.
The test-fairness of the ADLib-cardio is of particular importance, as an unfair item can heavily impact results of instruments with a low item number [ 39].
Another source of error is a low item non-response rate which relates to a single question or a group of questions.
However, due to a low item number in the tentative subscales 2 5 (with 2 or 3 items each), we favoured the more appropriate 3-factor solution which explains 53.8% of variance (Table 2).
In the standard rating protocol, the absence of criterion behaviour is penalized by a low item score, whereas judging a sub-item to be justifiably absent will lead to relatively higher item scores.
However, due to a low item number in the tentative subscales 6 and 7 (with 2 items each), we favored the more appropriate 6-factor solution, which explains 56.2% of variance and is provided in Table 2.
Similar(52)
demonstrated a low item-total correlation coefficient (0.263).
Also, item 28 had a low item-factor loading of 0.33.
Items with a low discrimination coefficient or with a low item-total correlation were eliminated.
A low item-factor loading for item 2 was also found in Turkey.
In the negative scale, the item 'insulin causes weight gain' showed a low item-total correlation (0.10), while the remaining item-total correlations were in the range of 0.46 to 0.74.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com