Proportion of babies developing severe ROP and the proportion treated (%), by study period
| Period 1 High oxygen saturations and treated at threshold from Jan 2003 to June 2004: (N=577) | Period 2 Low oxygen saturations and treated at threshold: from July 2004 to July 2005 (N=414) | Period 3 Low oxygen saturations and treated at type 1 from Aug 2005 to Dec 2006 (N=541) | Period 1+2+3 (N=1532) | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Developed severe ROP | Developed severe ROP | Developed severe ROP | Developed severe ROP | |||||||||
| Screening criteria | Exam. | N (%) | Treated (%) | Exam. | N | Treated (%) | Exam. | N | Treated (%) | Exam. | N | Treated (%) |
| ≤1500 g or ≤ 32 weeks | 167 | 30 (18%) | 26 (86.7%) | 87 | 12 (13.8%) | 8 (66.7%) | 111 | 8 (7.2%) | 8 (100%) | 365 | 50 (13.7%) | 42 (84%) |
| (i.e. within UK criteria) | ||||||||||||
| >1500 g and >32 weeks | 410 | 10 (2.4%) | 8 (80%) | 327 | 3 (0.9%) | 2 (66.7%) | 430 | 2 (0.5%) | 2 (100%) | 1167 | 15 (1.3%) | 12 (90%) |
| (i.e. outside UK criteria) | ||||||||||||
| Total | 577 | 40 (6.9%) | 34 (85%) | 414 | 15 (3.6%) | 10 (66.7) | 541 | 10 (1.8%) | 10 (100%) | 1532 | 65 (4.2%) | 54 (83.1%) |
| % with type 1 falling outside UK criteria | 25% | 20% | 20% | 23% | ||||||||
Exam., examined; ROP, retinopathy of prematurity.