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Search: authors:"Christian Tinner"

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Randomized controlled comparison of cross-sectional survey approaches to optimize follow-up completeness in clinical studies

Contributions Conceptualization: Regula S. von Allmen, Ju?rg Schmidli, Hendrik T. Tevaearai, Florian Dick. Data curation: Regula S. von Allmen, Christian Tinner. Formal analysis: Regula S. von Allmen, Christian ... Tinner, Ju?rg Schmidli, Hendrik T. Investigation: Regula S. von Allmen, Florian Dick. Methodology: Regula S. von Allmen, Christian Tinner, Ju?rg Schmidli, Hendrik T. Tevaearai, Project administration

Completeness of Follow-Up Determines Validity of Study Findings: Results of a Prospective Repeated Measures Cohort Study

Background Current reporting guidelines do not call for standardised declaration of follow-up completeness, although study validity depends on the representativeness of measured outcomes. The Follow-Up Index (FUI) describes follow-up completeness at a given study end date as ratio between the investigated and the potential follow-up period. The association between FUI and the...