|  | PVP (n = 5) | NS (n = 6) | Control (n = 8) | Total (n = 19) |
---|---|---|---|---|---|
Sex | Male | 3 | 4 | 5 | 12 |
 | Female | 2 | 2 | 3 | 7 |
Age | > 40 years | 0 | 1 | 0 | 1 |
 | 30–39 years | 4 | 1 | 5 | 10 |
 | < 30 years | 1 | 4 | 3 | 8 |
Received vaccination | 1 dose | 0 | 0 | 1 | 1 |
 | 2 doses | 3 | 6 | 7 | 16 |
 | 3 doses | 2 | 0 | 0 | 2 |
Time since last vaccination | < 3 months | 1 | 2 | 4 | 7 |
 | 3–6 months | 4 | 3 | 2 | 9 |
 | > 6 months | 0 | 1 | 2 | 3 |
Body mass index | 18–25 kg/m2 | 1 | 1 | 2 | 4 |
 | 25–30 kg/m2 | 2 | 4 | 5 | 11 |
 | 30–35 kg/m2 | 0 | 0 | 1 | 1 |
 | > 35 kg/m2 | 2 | 0 | 0 | 2 |