Studies using the 12-item Short Form Health Survey (SF-12) have verified the questionnaire as a valid and reliable measure for evaluating overall community health status [ 10, 11] as well as minority ethnic groups [ 12, 13].
The Cronbach's α coefficient was calculated for all SF 36 scores to verify the questionnaire reproducibility and reliability, and values higher than 0.7 were considered satisfactory.
Interviewers verified the completeness of questionnaires at collection.
While behavioural data rely on self-report that cannot be verified, the anonymity of the questionnaire and study protocols present little incentive to misreport.
(Manager) The questionnaire survey verified the findings from the in-depth interview: 70% of respondents agreed that they would report self-errors while only one-third of respondents would report errors made by their colleagues.
The nurses verified the completion of each questionnaire prior to collection.
Study investigators, blinded to the questionnaire or assay data, verified the reports of prostate cancer by participants and reviewed medical records and pathology reports to determine the tumor Gleason score and stage (according to the TNM classification scheme).
The back-translated version was verified by the questionnaire's first author, whose comments were taken into account for the adaption of the German version.
In addition, a cognitive pretest was executed (N = 3) [ 55] to verify the properties of the questionnaires by oral interviews.
To verify the validity of the questionnaire, five experts performed a content validity test, evaluating whether the questionnaire items conformed to the study topic.
