|   |   Study groups | 
      
        | Control group In=25
 | PIU-groupn=25
 | Alcohol groupn=25
 | Control group IIn=25
 | 
      
        | Mean/n | SD/% | Mean/n | SD/% | Mean/n | SD/% | Mean/n | SD/% | 
      
        | Age    (T-test) | M=29.5 | SD=9.6 | M=29.4** | SD=10.8 | M=41.4 | SD=9.0 | M=39.6 | SD=10.3 | 
      
        | Female    (Pearson Chi-Square) | 6 | 24% | 6 | 24% | 8 | 32% | 8 | 32% | 
      
        | Male    (Pearson Chi-Square) | 19 | 76% | 19 | 76% | 17 | 68% | 17 | 68% | 
      
        | college degree (Pearson Chi-Square) | 10 | 40% | 12* | 48% | 5 | 20% | 5 | 20% | 
      
        | Occupied    (Pearson Chi-Square) | 20* | 80% | 11 | 44% | 8*** | 36% | 22 | 88% | 
      
        | Single    (Pearson Chi-Square) | 9 | 36% | 13 | 52% | 13* | 52% | 4 | 16% | 
      
        | without children (Pearson Chi-Square) | 18 | 72% | 19* | 76% | 14 | 56% | 14 | 56% |