32 Chapter 2 Figure 1. Flowchart of the article selection process for the research question related to the quality of the outcome measurement instruments. Abbreviations; AT: Achilles Tendinopathy. Step 4 - An online-survey on outcome measurement instruments as COS-AT (second round Delphi procedure) The second online survey was sent to the participants at 25th July 2023. For each included outcome measurement instrument, we displayed the results of step 2 and 3 to the participants and asked whether this outcome measurement instrument should be part of the COS-AT. 29 participants (12 patients (41%); 11 (38%) women and 18 (62%) men) completed the online survey of whom 11 (38%) were women and 18 (62%) were men. The results of this survey are displayed in online Supplementary File 5 (Table 1). More than 70% of the participants agreed that 3 of the 22 outcome measurement instruments should be included in the COS-AT. These outcome measurement instruments were 1) the (Victorian Institute of Sports Assessment-Achilles) VISA-A questionnaire13, 2) the single-leg heel rise
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