Table 2 Analysis of risk factors for redetachment.
| Variable | Data | Mean (SD) | Frequency of redetachment/total number | Percentage | p Value |
|---|---|---|---|---|---|
| Duration of symptoms (days)* | Redetached | 11.3 (15.8) | 0.36 | ||
| Attached | 11.8 (17.7) | ||||
| Preoperative VA (logMAR)* | Redetached | 1.47 (1.20) | 0.15 | ||
| Attached | 1.10 (1.13) | ||||
| Lens status | Phakic | 13/94 | 14 | 0.77 | |
| Pseudophakic | 4/37 | 11 | |||
| Vitreous haemorrhage | No | 16/118 | 14 | 0.47 | |
| Yes | 1/13 | 8 | |||
| Extent of detachment (quadrants) | 1 | 1/32 | 3 | 0.045 | |
| 2–4 | 16/99 | 16 | |||
| Vertical location of detachment | Inferior quadrants | 4/37 | 11 | 0.39 | |
| Superior quadrants | 5/68 | 7 | |||
| Retinal breaks, number | 1 | 7/71 | 10 | ||
| 2–4 | 8/50 | 16 | 0.29 | ||
| Not found | 2/10 | 20 | 0.38 | ||
| Inferior breaks (4–8 o'clock) | Yes | 6/30 | 20 | 0.13 | |
| No | 9/91 | 10 | |||
| Macular status | Off | 12/80 | 15 | 0.435 | |
| On | 5/49 | 10 | |||
| Preoperative PVR grade | 0–A | 17/116 | 15 | 0.11 | |
| B–C3 | 0/15 | 0 | |||
| Retinotomy | Yes | 7/31 | 23 | 0.070 | |
| No | 10/100 | 10 | |||
| Intraoperative tamponade | SF6 | 12/101 | 12 | 0.13 | |
| C3F8 or C2F6 | 4/16 | 25 | |||
| Silicone oil | 1/14 | 7 | |||
| Laser effects* | Redetached | 454 (156) | 0.16 | ||
| Attached | 418 (147) | ||||
| Period of surgery | First 18 months | 12/68 | 18 | 0.081 | |
| Last 18 months | 5/63 | 8 |
C2F6, hexafluoroethane; C3F8, perfluoropropane; logMAR, logarithm of the minimum angle of resolution; PVR, proliferative vitreo retinopathy; SF6, sulphur hexafluoride; VA, visual acuity.
Eyes with redetachment (n = 17) compared with eyes where the retina was completely attached (n = 114). Data were analysed as categorical variables using Fisher's exact test or as numerical variables (*) using the Mann–Whitney U test.