Table 3. ROP incidence of twins and singletons.
| ROP | Singletons | Twins |
| non- ROP | 458(90.2) | 49(81.7) |
| ROP1 | 25(4.9) | 3(5.0) |
| ROP2 | 16(3.2) | 3(5.0) |
| ROP3 | 7(1.4) | 3(5.0) |
| ROP4 | 1(0.2) | 1(1.7) |
| ROP5 | 1(0.2) | 1(1.7) |
| Total | 508(100) | 60(100) |
n(%)
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