Characteristics High Risk (n=500) Low Risk (n=4,567) P values
Age (Mean ± SD) 32.3 ± 10.1 29.8 ± 8.9 <0.01
Sex (%)                                                                                                                 
        Female 17.6 22.5 0.01
        Male 82.4 77.5 0.01
History of donation (%)                                                                                    
      First time 58.4 47.3 <0.01
      Repeater 41.2 52.6 <0.01
      No answer 0.4 0.1 0.15
Type of Donor (%)                                                                                            
        Mass Blood Donation 0 13 <0.01
        Walk In 0 1.5 <0.01
        Donor Replacement 100 85.4 <0.01
        Pre–Deposit 0 0.1 0.46
Occupation (%)
       Unemployed 23.8 22 0.35
       Student 24.2 9.7 <0.01
       Clerk/ Call center 1.8 1.3 0.35
       OCW/Seafarer 4 2.7 0.09
       Nurse/Doctor 0.2 2 <0.01
       White collar 66 58.8 <0.01
       No answer 0 3.6 <0.01
Table 1: Characteristics of study participants by low-risk and high-risk groups (N=5,067).