Table 1. Characteristics of included studies.
| Parameters |
Study groups |
Control groups |
||||||||||
| Study | Year | No. | M:F | Mean age (y) | Mean weight (kg) | Disease course (mo) | Number of patients of first attack | No. | M:F | Mean age (y) | Mean weight (kg) | Health condition |
| Garg | 1997 | 30 | 30:0 | 28.6±5.59 | Not available | 8.56±4.19 | 30 (100%) | 30 | 30:0 | 29.27±5.07 | Not available | Unhealthya |
| Zarkir | 2009 | 23 | 22:1 | 37.1±9.7 | 53.80±5.44 | 25.13±12.11 | 22 (100%) | 12 | 11:1 | 35.7±9.2 | 51.87±6.95 | Unhealthyb |
| Shang | 1999 | 44 | 40:4 | 38.79±8.27 | Not available | 2-8 | 44 (100%) | 41 | 37:4 | 38.63±8.16 | Not available | Healthy |
| Wang | 2007 | 50 | 41:9 | 38.5±14.2 | Not available | <10 | Not available | 40 | 32:8 | 38.8±13.9 | Not available | Healthy |
| Xu | 1994 | 40 | 28:12 | 38.3 | Not available | 3-120 | 33 (82.5%) | 30 | 21:9 | 36.4 | Not available | Healthy |
aAcute unilateral retinal detachment; bTen had retinal detachment (cases), one had central retinal artery occlusion and one had vitreous hemorrhage.