Univariate logistic regression analysis of possible risk factors for anatomical failure following primary surgery
| Study factors | OR (95% CI) | p Value | Data missing (N) |
| Age (years) | 1.01 (0.99 to 1.03) | 0.325 | 0 |
| Preoperative duration (days) | 1.00 (1.00 to 1.01) | 0.448 | 10 |
| Intraocular pressure at presentation (mm Hg) | 0.98 (0.93 to 1.04) | 0.472 | 13 |
| Preoperative vitreous haemorrhage (yes vs no) | 1.41 (0.77 to 2.56) | 0.260 | 7 |
| Previous lens extraction (yes vs no) | 1.49 (0.93 to 2.37) | 0.093 | 10 |
| Preoperative cells (yes vs no) | 1.35 (0.28 to 6.50) | 0.701 | 0 |
| Preoperative quadrants of retinal detachment | 1.69 (1.33 to 2.15) | <0.001 | 0 |
| Preoperative myopia (>6 vs ≤6) | 0.80 (0.41 to 1.59) | 0.528 | 69 |
| Proliferative vitreoretinopathy grade C (yes vs no) | 3.98 (1.47 to 10.73) | 0.006 | 3 |
| Retinal breaks in inferior detached retina (yes/no) | 1.15 (0.68 to 1.94) | 0.602 | 103 |
| Retinal breaks in inferior attached retina (yes/no) | 0.85 (0.42 to 1.74) | 0.656 | 103 |
| Density of vitreous haemorrhage (fundus obscuring vs non fundus obscuring) | 1.48 (0.40 to 5.40) | 0.555 | 17 |
| Preoperative no of breaks | 1.08 (0.98 to 1.20) | 0.116 | 1 |
Values in bold typeface are statistically significant.