| 
      
        | Group | Time    required for completion of surgery (minutes) |  
        | Whole    group | Intact    group | Ruptured    group |  
        | Median | Range | Median | Range | Median | Range |  
        | AI | 40 (10) | 30-65(10) | 35(3) | 35-40(3) | 45 (7) | 30-65(7) |  
        | AII | 31(10) | 25-55(10) | 29(6) | 25-35(6) | 35 (4) | 32-55(4) |  
        | B | 85(10) | 45-120 (10) | 85 (6) | 45-120(6) | 80(4) | 45-105(4) |  | 
  
    | Figures in parenthesis indicate number of animals. | 
  
    | Table 1: Median time required for completion of surgery in different groups of calves suffering from obstructive urolithiasis |