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| Point of comparison | Worse grade ROP |
Low grade ROP (80 infants) | No ROP (440 infants) | P | |
| Type 1 (16 infants) | Type 2 (24 infants) | ||||
| PWGR | <0.001a | ||||
| Median (range) | 0.1 (0.1 to −0.9) | 0.13 (0.14 to 0.11) | 0.15 (0.26 to −0.08) | 0.3 (0.61 to 0.02) | |
| Mean±SD | 0.0±0.1 | 0.13±0.04 | 0.16±0.1 | 0.3±0.13 | |
PWGR: Postnatal weight gain ratios; ROP: Retinopathy of prematurity. aStatistically significant difference.
