Newly written or omitted items on admission showed no differences in risk of PEs (OR 1.81 (0.51 to 6.37)), and nor did items written or omitted for patient leave (OR 0.66 (0.39 to 1.11)) when compared to those screened during patient stay.
The seven-day travel instrument was omitted, items to assess perceptions of the environment and TPB constructs were reduced, and the short form of the International Physical Activity Questionnaire (IPAQ) [ 15] replaced the RPAQ.
Altogether, the present findings highlight the possible suggestion of omitting item 4 of the SDSCA-G to improve its psychometric properties as a reliable and valid tool assessing self-management of diabetes type 2 in Germany.
Note that the online questionnaire automatically pointed out omitted items to students, so the problem of missing data arose mainly in the competence tests and due to panel attrition.
Each of the six domains is scored omitting items with a missing or 'not applicable' response.
Domain and subdomain scores were the mean of the appropriate individual item scores (omitting items with a missing score).
The WFIRS-P domain scores for each patient were the mean of the items in each domain, or of all the items for total score, omitting items with a missing or 'not applicable' score.
This was also observed by a high level of completeness where > 96% of the patients completed the questionnaire at both the visits without omitting items.
++ Sum score omitting item 8.
However, the overall residual means and standard deviations did not improve (omitting item 9: mean [SD], -0.498 [1.171]; omitting item 24: mean [SD], -0.494 [1.282]) and reliability decreased slightly (omitting item 9: 0.831; omitting item 24: 0.840).
