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| ROP | ≤1000g | 1001-1500g | 1501-2000g | 2001-2500g |
| Non-ROP | 9(36.0) | 70(76.1) | 185(92.0) | 243(97.2) |
| ROP1 | 8(32.0) | 8(8.7) | 8(4.0) | 4(1.6) |
| ROP2 | 4(16.0) | 6(6.5) | 6(3.0) | 3(1.2) |
| ROP3 | 3(12.0) | 5(5.4) | 2(1.0) | 0(0.0) |
| ROP4 | 1(4.0) | 1(1.1) | 0(0.0) | 0(0.0) |
| ROP5 | 0(0.0) | 2(2.2) | 0(0.0) | 0(0.0) |
| Total | 25(100) | 92(100) | 201(100) | 250(100) |
P<0.05
n(%)
