Table 2.
Intraoperative characteristics.
| Characteristics | S1 | S2 | P value | ||
|---|---|---|---|---|---|
| 2004-2005 | 2006–2008 | ||||
| N (%) | 95% CI | N (%) | 95% CI | ||
| PPV | 385 (80%) | 76.5%–83.6% | 446 (79.1%) | 75.7%–82.4% | 0.660 |
| Scleral band | 243 (50.6%) | 46.2%–55.1% | 346 (61.3%) | 57.3%–65.4% | <0.001 |
| PPV associated with band | 171 (44.4%) | 39.5%–49.4% | 266 (59.6%) | 55.1%–64.2% | <0.001 |
| Explant | 55 (11.6%) | 8.7%–14.5% | 39 (7%) | 4.9%–9.1% | 0.010 |
| Retinopexy (cryo) | 16 (3.4%) | 1.8%–5.1% | 28 (5.1%) | 3.2%–6.9% | 0.205 |
| Cryotherapy (clock hours) | 0.326 | ||||
| 1 | 92 (22%) | 18%–26% | 115 (21%) | 17.6%–24.4% | |
| 2 | 42 (10%) | 7.1%–12.9% | 65 (11.9%) | 9.2%–14.6% | |
| >2 | 16 (3.8%) | 2%–5.7% | 33 (6%) | 4%–8% | |
| No | 269 (64.2%) | 59.6%–68.8% | 335 (61.1%) | 57.1%–65.2% | |
| External drainage | 55 (11.6%) | 8.7%–14.4% | 63 (11.3%) | 8.6%–13.9% | 0.878 |
| Tamponade agent | 0.039 | ||||
| Air | 47 (9.9%) | 7.2%–12.5% | 31 (5.5%) | 3.6%–7.4% | |
| SF6 | 187 (39.2%) | 34.8%–43.6% | 226 (40.4%) | 36.3%–44.4% | |
| C3F8 | 191 (40%) | 35.6%–44.4% | 219 (39.1%) | 35.1%–43.1% | |
| Silicone oil | 22 (4.6%) | 2.7%–6.5% | 37 (6.6%) | 4.5%–8.7% | |
| No | 30 (6.3%) | 4.1%–8.5% | 48 (8.6%) | 6.3%–10.9% | |
| Laser (extension in clock hours) | <0.001 | ||||
| 0–2 | 284 (60%) | 55.6%–64.5% | 244 (43.6%) | 39.5%–47.7% | |
| 3–5 | 86 (18.2%) | 14.7%–21.7% | 114 (20.4%) | 17.1%–23.7% | |
| 6–8 | 35 (7.4%) | 5.1%–9.8% | 48 (8.6%) | 6.3%–10.9% | |
| ≥9 | 68 (14.4%) | 11.2%–17.6% | 154 (27.5%) | 23.8%–31.2% | |
| PFCL | 310 (65.1%) | 60.8%–69.4% | 376 (66.9%) | 63%–70.8% | 0.543 |
| Retinotomy | 28 (5.9%) | 3.8%–8% | 38 (6.7%) | 4.7%–8.8% | 0.561 |
| Retinectomy | 8 (1.7%) | 0.5%–2.9% | 3 (0.5%) | 0%–1.2% | 0.071 |
| Choroidal hemorrhage | 6 (1.3%) | 0.3%–2.3% | 13 (2.3%) | 1.1%–3.6% | 0.212 |
| Intravitreal hemorrhage | 18 (3.8%) | 2.1%–5.5% | 26 (4.6%) | 2.9%–6.4% | 0.518 |
| Cataract extraction associated | 60 (12.6%) | 9.6%–15.6% | 41 (7.3%) | 5.2%–9.5% | 0.004 |
| IOL | 49 (10.3%) | 7.6%–13.1% | 33 (5.9%) | 3.9%–7.8% | 0.009 |
N (%): number and percent of proliferative vitreo-retinopathy cases; CI: confidence interval; PPV: pars plana vitrectomy; PFCL: perfluorocarbon liquid intraoperative use; IOL: intraocular lens implantation during surgery.