| Variables Effect | Antibody responses | p-value | |||
| IgM+ n (%) | IgM- n (%) | IgG+ n (%) | IgG- n (%) | ||
| age range (years) | 0.44 | ||||
| 14 - 19 | 1 (8.34) | 30 (10.8) | 2(4.65) | 27 (10.98) | |
| 20 - 24 | 5 (41.66) | 56 (20.22) | 21 (48.84) | 56 (22.74) | |
| 25 - 29 | 3 (25) | 72 (25.99) | 16 (37.21) | 59 (23.93) | |
| 30 - 34 | 2 (16.66) | 99 (35.74) | 2 (4.65) | 87 (35.36) | |
| 35 - 44 | 1 (8.34) | 20 (7.25) | 2 (4.65) | 17 (6.99) | |
| Parity | 0.23 | ||||
| Nulliparous | 2 (1.66) | 77 (27.79) | 9 (20.94) | 55 (22.35) | |
| Pauciparous | 7 (58.34) | 108 (38.98) | 23 (53.48) | 93 (37.8) | |
| Multiparous | 3 (25) | 92 (33.23) | 11 (25.58) | 98 (39.85) | |