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IIRC classification of children with retinoblastoma at UCI based on worst affected eye(s).
| IIRC group | Total (N = 90) | Bilateral Rb | Unilateral Rb | ||
|---|---|---|---|---|---|
| Frequency | % age | Frequency | % age | ||
| C | 1 (1.1%) | 0 | 0 | 1 | 1.5 |
| D | 16 (17.8%) | 6 | 24 | 10 | 15.4 |
| E | 61 (67.8%) | 16 | 64 | 45 | 69.2 |
| Staging not done | 12 (13.3%) | 3 | 12 | 9 | 13.8 |
