The baseline data of silicone oil tamponaded eyes
| Category | Eyes with ERM (n=79) | Eyes without ERM (n=604) | P value |
| Gender (%) | 0.041 | ||
| Male | 36 (46) | 327 (54) | |
| Female | 42 (54) | 277 (46) | |
| Age (%) | 0.359 | ||
| I≤40 | 12 (15) | 91 (15) | |
| II 41–50 | 17 (22) | 111 (18) | |
| III 51–60 | 32 (41) | 218 (36) | |
| IV 61–70 | 13 (16) | 153 (26) | |
| V>70 | 5 (6) | 31 (5) | |
| Follow-up time (month, median ±IQR) | 12±6.3 | 12±5.8 | 0.998 |
| SOTT (%) | <0.001 | ||
| I (2–3) | 55 (70) | 341 (57) | |
| II (4–6) | 14 (18) | 195 (32) | |
| III (6–9) | 5 (6) | 32 (5) | |
| IV (9–12) | 1 (1) | 18 (3) | |
| V (>12) | 4 (5) | 18 (3) | |
| Photocoagulation energy (mV, %) | <0.001 | ||
| I (120–165) | 7 (9) | 94 (16) | |
| II (166–210) | 61 (77) | 420 (69) | |
| III (211–255) | 8 (10) | 78 (13) | |
| IV (256–300) | 3 (4) | 12 (2) | |
| Photocoagulation points (NO, %) | <0.001 | ||
| I (120–200) | 19 (24) | 115 (19) | |
| II (201–400) | 21 (27) | 149 (25) | |
| III (401–600) | 12 (15) | 82 (14) | |
| IV (601–800) | 11 (14) | 68 (11) | |
| V (>800) | 16 (20) | 190 (31) | |
| Electric coagulation (%) | 0.001 | ||
| Yes | 23 (29) | 246 (40) | |
| No | 56 (71) | 358 (60) | |
| Cryotherapy (%) | 0.156 | ||
| Yes | 13 (16) | 142 (24) | |
| No | 66 (84) | 462 (76) | |
| Preoperative VH (%) | <0.001 | ||
| Yes | 20 (25) | 164 (27) | |
| No | 59 (75) | 440 (73) | |
| Postoperative VH (%) | 0.989 | ||
| Yes | 1 (1) | 6 (1) | |
| No | 78 (99) | 598 (99) | |
| Type 2 diabetes (%) | <0.001 | ||
| Yes | 17 (22) | 137 (23) | |
| No | 62 (78) | 467 (77) | |
| Hypertension (%) | 0.016 | ||
| Yes | 22 (28) | 167 (28) | |
| No | 57 (72) | 437 (72) | |
| Retinal aperture size (%) | 0.435 | ||
| H<2 | 52 (66) | 423 (70) | |
| 2≤H<4 | 21 (27) | 127 (21) | |
| 4≤H<6 | 6 (7) | 42 (7) | |
| H≥6 | 0 (0) | 12 (2) | |
| Preoperative PVR (%) | <0.001 | ||
| No | 30 (38) | 556 (92) | |
| PVR(A) | 0 (0) | 0 (0) | |
| PVR(B) | 1 (1) | 0 (0) | |
| PVR(C1) | 4 (5) | 3 (1) | |
| PVR(C2) | 16 (20) | 8 (1) | |
| PVR(C3) | 12 (15) | 17 (2) | |
| PVR(D1) | 10 (13) | 7 (1) | |
| PVR(D2) | 4 (5) | 10 (2) | |
| PVR(D3) | 2 (3) | 3 (1) | |
| Preoperative CD (%) | 0.522 | ||
| Yes | 17 (22) | 30 (5) | |
| No | 62 (78) | 574 (95) | |
| ERM diagnostic method (%) | <0.001 | ||
| Intraoperative diagnosis | 47 (59) | 0 (0) | |
| Preoperative diagnosis | 32 (41) | 604 (100) |
CD, choroidal detachment; ERM, epiretinal membrane; PVR, proliferative vitreoretinopathy; SOTT, silicone oil tamponade time; VH, vitreous haemorrhage.