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Rates of retinopathy of prematurity (ROP) and laser surgery for each centre in each period in examined infants <1250 g
| Centre A | Centre B | |||||
|---|---|---|---|---|---|---|
| Period 1 | Period 2 | Period 3 | Period 1 | Period 2 | Period 3 | |
| ROP III–IV | 13% | 13%**,† | 6%† | 12%¶ | 5%**,¶ | 4% |
| LASER | 4.5% | 5% | 3% | 5%* | 3%* | 2% |
All comparisons (†;**; ¶; *): p < 0.05.
