Some users reported problems logging into Home and cases of items disappearing from their "virtual apartment".
In other cases of items essential for the interpretations of the trial results (such as the statistical analysis plan), tens of pages are reduced to a paragraph on sample size calculation in the journal report, underscoring the lack of detail (and its attendant problems) common to public forms of trial reporting.
This was the case of item FN1LC.
In the case of mathematics, we see a similar picture in the case of item dependence on mathematical formulas.
To evaluate item characteristics, item difficulty indices (defined as percentage of agreements among all responses), inter-item-correlations and corrected item-total-correlations were computed, and the items were analysed for an increase of the scale's reliability coefficient (Cronbach's α) in case of item deletion.
In the case of item 1 (I've felt tired or fatigued) and item 24 (I've had back pain), it was decided to retain item 24 as back pain is a common problem in PHPT and is also associated with a higher incidence of hip fracture [ 33, 34].
Especially in case of item (14) providing participant's information about the patient recruitment, the item was coded as "yes" only when the flow diagram was given or explicitly described (i.e. the number of controls per case was specified and the matching variables were clearly stated).
This might be the case of items that favor (or disfavor) some sample's subgroups (e.g., girls and boys, black and white, minorities).
This system can be used in the case of items with low size and weight, such as the pharmaceutical products, food, textile, and electronic components.
In the case of items related to clinical activities (for example blood pressure measurement), any register with missing values will be considered as not performed.
