| No. | Authors | Study Type | Number of Patients | Prevalence/1000 | Female | Male |
| 1. | Mufti (1988) [14] | P | 137 | NR | NR | NR |
| 2. | Al-Umran et al. (1988) [15] | P | 37 | 4.3 | 23 | 14 |
| 3. | Khan and Benjamin (1992) [16] | P | 81 | 36.5 | 58 | 23 |
| 4. | Mirdad (2002) [17] | R | 300 | 3.5 | 235 | 65 |
| 5. | Kremli et al. (2003) [10] | P | 600 | NR | 513 | 87 |
| 6. | Kurdi et al.(2016) [18] | R | 166 | 4.90 | NR | NR |
| 7. | Alhunaishel et al. (2016) [19] | R | 136 | NR | 106 | 30 |
| 8. | Al-Anazi et al. (2017) [20] | P | 300 | 3.1 | 220 | 80 |
| 9. | Al-Mohrej et al. (2017) [21] | R | 176 | NR | 151 | 25 |
| 10. | Assaf (2018) [22] | R | 104 | NR | 90 | 14 |