| Characteristic | IgM Reactive | IgM non-reactive | P-value | IgG Reactive | IgG non-reactive | P-Value |
| n = 28 | n = 330 | n = 38 | n = 320 | |||
| Gender | 0.0142 | 0.0163 | ||||
| Female (%) | 9 (32.1) | 121 (36.7) | 13 (34.2) | 117 (36.6) | ||
| Male (%) | 19 (67.9) | 209 (63.3) | 25 (65.8) | 203 (63.4) | ||
| Age group (years) | 0.757 | 0.025 | ||||
| <20 | 1 (3.6) | 47 (14.2) | 1 (2.6) | 46 (14.4) | ||
| 20 - 40 | 22 (78.6) | 249 (45.2) | 33 (86.8) | 239 (43.4) | ||
| >40 | 5 (17.9) | 34 (10.3) | 4 (10.5) | 35 (10.9) | ||
| Level of Education | 0.0338 | 0.639 | ||||
| Primary | 0 (0) | 7 (2.1) | 0 (0) | 7 (2.2) | ||
| Secondary | 10 (35.7) | 77 (23.3) | 11 (28.9) | 76 (23.8) | ||
| Tertiary | 15 (53.6) | 208 (63) | 24 (63.2) | 199 (62.2) | ||
| None | 3 (10.7) | 38 (11.5) | 3 (7.9) | 38 (11.9) |