Regional and global estimates of the annual incidence of retinopathy of prematurity (ROP), by severity, the number treated and the annual incidence of visual loss, by severity (from Blencowe)6
| High income | Middle | Low | Total* | |
|---|---|---|---|---|
| income | income | |||
| Number with any ROP | 41 400 | 139 000 | 4300 | 184 700 |
| % of global total | 22% | 75% | 2% | 100% |
| Number with severe ROP | 8700 | 43 400 | 1400 | 53 500 |
| Phenotype of babies with severe ROP | Most <1250 g; all <1500 g | Wide heterogeneity with babies affected up to <∼2500 g and <∼34 weeks | ||
| Number treated for severe ROP | 6700 | 15 700 | 300 | 22 700 |
| % of cases of severe ROP treated | 79% | 38% | 21% | |
| Number with mild/moderate visual impairment from ROP | 2900 | 9200 | 200 | 12 300 |
| Number with severe visual impairment or blind from ROP | 2600 | 16 900 | 600 | 20 000 |
| Total with visual loss | 5400 | 26 100 | 800 | 32 300 |
| % of total burden of ROP-associated visual loss | 17% | 81% | 2% | 100% |
Source: data based on reanalysis of Blencowe et al by WHO income groupings 6*Numbers may not sum due to rounding.