| Characteristic | N | DAT    of Cord blood | χ2 (df) | P-value | 
      
        | Positive | Negative | 
      
        | Overall | 50 | 12 (24.0%) | 38 (76.0%) | 13.52 (1) | <0.001**** | 
      
        | Age    Group (yrs) | 
      
        | < 25 25 - 30
 31+
 | 20 16
 14
 | 2 (10.0%) 3 (18.8%)
 7 (50.0%)
 | 18 (90.0%) 13 (81.3%)
 7 (50.0%)
 | 
 7.58 (2)
 | 
 0.023*
 | 
      
        | Parity | 
      
        | 1 2
 3
 4+
 | 21 10
 12
 7
 | 3 (14.3%) 2 (20.0%)
 2 (16.7%)
 5 (71.4%)
 | 18 (85.7%) 8 (80.0%)
 10 (83.3%)
 2 (28.6%)
 | 
 
 10.16 (3)
 | 
 
 0.017*
 | 
      
        | Blood    group | 
      
        | A AB
 B
 O
 | 16 4
 11
 19
 | 3 (18.8%) 1 (25.0%)
 2 (18.2%)
 6 (31.6%)
 | 13 (81.3%) 3 (75.0%)
 9 (81.8%)
 13 (68.4%)
 | 
 
 1.046 (3)
 | 
 
 0.790 ns
 |