| Epidemiological data | Frequency (n) | Percentage (%) |
| Sex (n = 706) |
|
|
| Male | 563 | 79.75 |
| Female | 143 | 20.25 |
| Geographic origin (n = 706) | ||
| Suburban | 415 | 58.78 |
| Urban | 157 | 22.23 |
| Rural | 134 | 18.98 |
| Occupation (n = 479) |
|
|
| Students | 115 | 24.00 |
| Manual workers | 106 | 22.12 |
| Traders | 44 | 9.18 |
| Farmers | 27 | 5.63 |
| Unemployed | 12 | 2.50 |
| Manager | 9 | 1.87 |
| others employs | 166 | 34.65 |
| Vaccination status (n = 683) |
|
|
| Vaccination record not available | 680 | 99.56 |
| Vaccination record available | 3 | 0.44 |
| No Booster vaccination | 595 | 87.11 |
| School level (n = 706) |
|
|
| None | 449 | 63.59 |
| Primary | 167 | 23.79 |
| Secondary | 75 | 10.62 |
| University | 16 | 2.26 |