| Risk factor | 
        Sensitivity (%) | 
        Specificity (%) | 
        Positive predictive value (%)  | 
        Negative predictive value (%) | 
       
      
        | Diabetes | 
        3.5 | 
        89.1 | 
        28.6 | 
        44.1 | 
       
      
        | Hypertension | 
        8.7 | 
        96.8 | 
        85.7 | 
        32.3 | 
       
      
        | Dyslipidemia | 
        10 | 
        93.3 | 
        14.3 | 
        90.3 | 
       
      
        | Smoking | 
        12.1 | 
        95.5 | 
        57.1 | 
        68.8 | 
       
      
        | Peripheral vascular disease | 
        No true    positives | 
        92.5 | 
        No true    positive | 
        46.5 | 
       
      
        | Stroke | 
        No true    positives | 
        92.8 | 
        No true    positives | 
        96.8 | 
       
      |