However, as other reports have documented item-feature effects in evolutionary explanations (Nehm and Ha, 2011), it is not clear to what extent content domain or question task may interact with specific item features.
The measured data quality, especially the completeness of the documented items per form, is high.
The maximum possible number of documented items in the record was 29.
Research personnel attended each site to observe staff while they taught a lesson and documented items related to program implementation.
Concerning the documented items per form, we distinguished between routine cases and retrospective cases and measured also the completeness of the whole data set.
Based on these export data, completeness of forms (reference: all prostate cancer patients in urology) and completeness of documented items per form were analysed.
The measured data quality, especially the completeness of documented items per form, was high but most of information was transferred from retrospective data collections (paper based documentation and spreadsheets).
We measured completeness of forms with respect to all tumour cases in the clinic and completeness of documented items per form as incomplete information can bias results of the survival analysis.
Strategies to maximise follow-up and prevent missing data, as well as the recording of reasons for missing data, are thus important to develop and document (Item 18b).
Revisions made to the original set of draft items were documented in an item tracking matrix.
Studies that randomly allocated patients (Item D), concealed randomisation (Item A), blinded participants (Items C, E, F) and documented study withdrawals (Item B) were reported to reflect higher quality [ 19, 20].
