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| ROP stage | Ventilated babies (N=35) | Sub-tenon anaesthesia (N=27) | P-value |
|---|---|---|---|
| Zone2: stage 2 plus | 30 | 19 | 0.2 |
| Zone2: stage 3 plus | 5 | 8 | 0.2 |
| Mean gestational age (weeks) | 25+1 (range 23+1–29+6) | 25+2 (range 23–27+3) | 0.09 |
| Mean birth weight (g) | 676 (SD 174; range 450–1422) | 776 (SD 143; range 450–1200) | 0.001 |
| Mean PMA at treatment (weeks) | 37 (range 33+4–44+6) | 37+2 (range 33+4–42+2) | 0.068 |
