| Age    group | 
          | 
        Endo-RU | 
        Ecto-RU | 
        Endo-RL | 
        Ecto-RL | 
        Endo-LU | 
        Ecto-LU | 
        Endo-LL | 
        Ecto-LL | 
       
      
        | 21-30 | 
        N | 
        39 | 
        39 | 
        39 | 
        39 | 
        39 | 
        39 | 
        39 | 
        39 | 
       
      
        |   | 
        mean | 
        1.38 | 
        0.94 | 
        1.46 | 
        0.94 | 
        1.53 | 
        1.02 | 
        1.66 | 
        1.05 | 
       
      
        | 31-40 | 
        N | 
        10 | 
        10 | 
        10 | 
        10 | 
        10 | 
        10 | 
        10 | 
        10 | 
       
      
        |   | 
        mean | 
        2.4 | 
        1.7 | 
        2.8 | 
        1.5 | 
        2.4 | 
        1.7 | 
        2.2 | 
        1.5 | 
       
      
        | 41-50 | 
        N | 
        21 | 
        21 | 
        21 | 
        21 | 
        21 | 
        21 | 
        21 | 
        21 | 
       
      
        |   | 
        mean | 
        2.33 | 
        1.42 | 
        2.61 | 
        1.61 | 
        2.3 | 
        1.47 | 
        2.66 | 
        1.66 | 
       
      
        | Total | 
        N | 
        70 | 
        70 | 
        70 | 
        70 | 
        70 | 
        70 | 
        70 | 
        70 | 
       
      
        |   | 
        mean | 
        1.81 | 
        1.2 | 
        2 | 
        1.22 | 
        1.91 | 
        1.25 | 
        2.04 | 
        1.3 | 
       
      |