| 
      
        | Age
          group |  | Endo-S1 | Ecto-S1 | Endo-S2 | Ecto-S2 | Endo-S3 | Ecto-S3 |  
        | 21-30 | N | 39 | 39 | 39 | 39 | 39 | 39 |  
        |  | mean | 1.28 | 0.64 | 1.79 | 0.69 | 1.23 | 0.58 |  
        | 31-40 | N | 10 | 10 | 10 | 10 | 10 | 10 |  
        |  | mean | 2.4 | 1.6 | 2.4 | 1.3 | 2.4 | 1.3 |  
        | 41-50 | N | 21 | 21 | 21 | 21 | 21 | 21 |  
        |  | mean | 2.63 | 2.38 | 2 | 0.71 | 1.69 | 1.19 |  
        | Total | N | 70 | 70 | 70 | 70 | 70 | 70 |  
        |  | mean | 1.75 | 0.8 | 1.71 | 0.9 | 1.62 | 0.87 |  |