Additional file 1 of Associations between sport participation and knee symptoms: a cross-sectional study involving 3053 undergraduate students

Additional file 1: Appendix 1 A hardcopy of questionnaire in the current study. Appendix 2. Flowchart of participants included in final analyses. Appendix 3. Detailed Characteristics of the respondents included in the study. Appendix 4. Number of participants and average participation hours in each sport (n = 3053). Appendix 5. Potential risk factors and association with knee pain analyzed in univariate analysis. Appendix 6. Percentage of participants stratified by self-rated competitiveness and number of regularly participated sports (≥1 per week)