Table 2.
Characteristics of systematic reviews examined
| Characteristic | Number of systematic reviews (N = 175) |
|---|---|
| n (%) | |
| Year published | |
| 2003–2005 | 3 (2) |
| 2006–2008 | 12 (7) |
| 2009–2011 | 15 (9) |
| 2012–2014 | 68 (39) |
| 2015–2017 | 77 (44) |
| Population (function/region of eye) addressed | |
| Retinal/choroidal disease | 35 (20) |
| Visual impairment/low vision | 33 (19) |
| Optic nerve, including glaucoma | 32 (18) |
| Ocular surface | 31 (18) |
| Lens | 18 (10) |
| Ocular vasculature | 5 (3) |
| Other | 21 (12) |
| Interventions and comparators examineda | |
| Drug | 74 (42) |
| Surgery | 67 (38) |
| Other procedure | 31 (18) |
| Device | 15 (9) |
| Supplements | 6 (3) |
| Screening/testing | 5 (3) |
| Other intervention | 26 (15) |
| Number of outcome domains examined | |
| Median | 6 |
| Interquartile range | 5 to 8 |
| Range | 1 to 19 |
| Number of primary outcome domains examined | |
| Median | 1 |
| Interquartile range | 1 to 1 |
| Range | 0 to 5 |
| Number of secondary outcome domain examined | |
| Median | 4 |
| Interquartile range | 3 to 6 |
| Range | 0 to 12 |
| Number of other outcome domains examined | |
| Median | 1 |
| Interquartile range | 0 to 2 |
| Range | 0 to 6 |
| Number of studies included | |
| Median | 3 |
| Interquartile range | 1 to 9 |
| Range | 0 to 137 |
aMore than one category could apply