Table 1.

Overview of research topics per questionnaire in this study.

Research topics	Enrollment questionnaire	At 1 month after enrollment	At 3 months after enrollment	At 5 months after enrollment
Age	Present	N/Aa	N/A	N/A
Sex	Present	N/A	N/A	N/A
Sports participation other than running	Present	Absent	Absent	Absent
Running motivation	Present	Absent	Absent	Absent
Running experience (in months or years)	Present	Absent	Absent	Absent
Level of running (novice, seminovice, experienced, etc)	Present	Absent	Absent	Absent
Running frequency per week	Present	Present	Present	Present
Physical fitness	Present	Present	Present	Present
Risk perception	Present	Present	Present	Present
Injury-preventive behavior	Present	Present	Present	Present
Running-related injuries	Present	Present	Present	Present
Physical complaints	Present	Present	Present	Present

^aN/A: not applicable.