Description of preoperative characteristics (intention-to-treat set)
| Surgery | |||
|---|---|---|---|
| (E1) 20 G vitrectomy with EB (n=100) | (E2) 23/25 G vitrectomy without EB (n=57) | (C) 20 G vitrectomy without EB (n=98) | |
| Characteristic | Summary statistics | Summary statistics | Summary statistics |
| Sex, male | 70 (70.0%) | 43 (75.4%) | 71 (72.4%) |
| Age, years | 65±10 | 66±9 | 64±10 |
| Study eye, right†* | 51 (51.0%) | 20 (35.1%) | 55 (56.1%) |
| Sphere, dioptre‡ | 0.00 (−0.25 to 0.75) | 0.00 (−0.50 to 0.25) | 0.00 (−0.75 to 0.63) |
| Cylinder, dioptre‡ | −0.50 (−1.25 to 0.00) | −0.25 (−0.75 to 0.00) | −0.50 (−1.13 to 0.00) |
| Axis, degree‡ | 76 (0 to 128) | 45 (0 to 120) | 54 (0 to 112) |
| Intraocular pressure, mm Hg‡ | 14 (12 to 16) | 15 (12 to 18) | 15 (12 to 17) |
| Visual acuity, logMAR‡ | 1.1 (0.3 to 1.7) | 1.0 (0.5 to 1.7) | 0.8 (0.3 to 1.7) |
| Vitreous situation at start of surgery | |||
| Fully attached | 6 (6.0%) | 5 (8.8%) | 9 (9.2%) |
| Partly attached | 37 (37.0%) | 22 (38.6%) | 41 (41.9%) |
| Fully detached | 56 (56.0%) | 30 (52.6%) | 44 (44.9%) |
| Haemorrhage | 0 (0.0%) | 0 (0.0%) | 1 (1.0%) |
| Other | 1 (1.0%) | 0 (0.0%) | 3 (3.1%) |
| Cataract surgery uneventful, yes‡ | 89 (89.0%) | 48 (84.2%) | 89 (91.8%) |
| Laser, yes | 4 (4.0%) | 7 (12.3%) | 8 (8.2%) |
| Cryocoagulation, yes | 1 (1.0%) | 0 (0.0%) | 1 (1.0%) |
| Gas injection, yes | 0 (0.0%) | 0 (0.0%) | 0 (0.0%) |
| Anti-VEGF injection, yes | 0 (0.0%) | 0 (0.0%) | 1 (1.0%) |
Summary statistics are either count (percentage), mean±SD or median (25th to 75th percentile), contingent on distributional characteristics.
*p≤0.05, **p≤0.01, ***p≤0.001, †p=0.038 from Pearson's χ2 test.
‡Percentage of missing data ≤3.5%; otherwise complete data.
EB, encircling band; G, gauge; VEGF, vascular endothelial growth factor.