Item  Description and criteria 

Study population  
1  Study groups (patients and controls) are clearly defined: Positive if at least four of the following items in both groups were reported at baseline: age, gender, BMI, physical activity, previous treatments and duration of symptoms 
2  Comparable groups: Positive if the study controls are comparable to the patients for age and gender 
3  Number of cases ≥50: Positive if the total number of cases (patients) was ≥50 
Study design  
4  Inclusion and exclusion criteria: Positive if inclusion and exclusion criteria were described

Assessment of determinant and outcome  
5  Definition of determinant: Positive if a clear definition of potential determinant (variable that might be associated with plantar fasciopathy) was described 
6  Assessment of determinant: Positive if the type and methods of measurement and the setting were described and suitable 
Analysis and data presentation  
7  Data presentation: Positive if risk estimates were presented or when raw data were given that allow for the calculation of risk estimates, such as ORs, prevalence ratios or relative risks 
8  Consideration of confounders: Positive if at least three of the following confounders were considered and described: activity levels and/or standing time, systemic disease, foot alignment, BMI, age and gender 
9  Control for confounding: Positive if, for a minimum of three confounders mentioned in item 8, the method used to control for confounding was described 
BMI, body mass index.