| Variables | Cases | Controls | p-value | 
      
        | Age | Mean ± Sd | 28.61 ± 8.51 | 28.61 ± 8.35 | 0.91* | 
      
        | Sex | Male
            
            Female | 27(57.4%)
            20(42.6%) | 27(57.4%) 20(42.6%) | 1.# | 
      
        | Material status | Single
            Married
              
          Divorced | 25(53.2%)
            22(46.8%)
              
          0(.0%) | 24(51.1%)
            22(46.8%)
            
          1(2.1%) | 0.6# | 
      
        | Income (Toman) | <200000
            200000-400000
              
            400000-600000
        >600000 | 9(19.1%)
          
          12(25.5%)
          14(29.8%)
          12(25.5%) | 9(19.1%)
            
            13(27.7%)
          13(27.7%)
          
          12(25.7%) | 0.99# | 
      
        | Occupation | Employee
            
            Workman
            
            Housewife
            
            Businessman
          Student
          Unemployed
          Engineer | 15(31.9%)
            
            2(4.3%)
            
            7
          (14.9%)
          11(23.4%)
          8(17.0%)
          
          1(2.1%)
          
          3(6.4%) | 12(25.5%)
            
            1(2.1%)
            
            10(21.3%)
            
            13(27.7%)
            
            8(17.0%)
          1(2.1%)
          
          2(4.3%) | 0.95# | 
      
        | Education | No diploma
            Diploma
              
            Bachelor or master
            
          Doctoral degree | 12(25.5%)
            
            22(46.8%)
            
            13(27.7%)
            
          0(.0%) | 14(29.8%)
          17(36.2%)
          
          15(31.9%)
          1(2.1%) | 0.58# | 
      
        | Score | Mean ± Sd | 6.97 ± 1.01 | 7.12 ± 0.91 | 0.95# |