| Variables Effect | Antibody response | p-value | |
| IgM+ n = 54 (%) | IgG+ n = 132 (%) | ||
| Group of age (years) | 0.018 | ||
| 14 - 19 | 10 (18.52) | 13 (9.84) | |
| 20 - 24 | 14 (25.92) | 58 (43.94) | |
| 25 - 29 | 13 (24.1) | 29 (21.97) | |
| 30 - 34 | 8 (14.9) | 18 (13.64) | |
| 35 - 44 | 9 (16.66) | 14 (10.61) | |
| Parity | 0.23 | ||
| Nulliparous | 15 (27.8) | 28 (21.22) | |
| Pauciparous | 26 (48.13) | 65 (49.24) | |
| Multiparous | 13 (24.07) | 39 (29.54) | |