| Age group (months) | Laterality Unilateral | Bilateral | Total | |
| Number | Percentage (%) | |||
| < 12 | 10 | 5 | 15 | 7 |
| [12 - 24] | 19 | 15 | 34 | 17 |
| [24 - 36] | 28 | 10 | 38 | 19 |
| [36 - 48] | 49 | 11 | 60 | 29 |
| [48 - 60] | 30 | 4 | 34 | 17 |
| ≥60 | 21 | 2 | 23 | 11 |
| Total | 157 | 47 | 204 | 100 |