| 
      
        | covaraites | Estimated    coeff(SE) | 95%    confidence | Exp(coeff) | 95%    confidence |  
        | Intercept | 2.092(0.332) | [1.477,2.784]** | 8.100 | [4.379,16.187]** |  
        | Width of fistula |  |  |  |  |  
        | <=2centimeter |  |  |  |  |  
        | 3-5 centimeter | [-0.774(0.379) | [-1.517,-0.025]** | 0.461 | [0.219,0.975]** |  
        | Length of fistula |  |  |  |  |  
        | <=2centimeter |  |  |  |  |  
        | 3-5 centimeter | -1.060(0.424) | [-1.892,-0.223]** | 0.346 | [0.151,0.800]** |  
        | Bladder size |  |  |  |  |  
        | None |  |  |  |  |  
        | Small | -0.245(0.373) | [-0.974,0.497] | 0.783 | [0.378,1.644] |  
        | Fair | -1.622(0.718) | [-3.107,-0.223]** | 0.197 | [0.045,0.800]** |  
        | Place of delivery |  |  |  |  |  
        | Health institution |  |  |  |  |  
        | Home | -0.561(0.362) | [-1.274,0.152] | 0.571 | [0.280,1.164] |  |