Table 3.
Reasons for Treatment Failure in the PTVT Study
| Tube Group (n = 49) | Trabeculectomy Group (n = 38) | |
|---|---|---|
| Inadequate IOP reduction* | 31 (63) | 23 (61) |
| Reoperation for glaucoma | 18 (37) | 9 (24) |
| Persistent hypotony† | 0 | 5 (13) |
| Loss of light perception | 0 | 1 (3) |
IOP = intraocular pressure
Data are presented as number of patients (percentage)
*
IOP > 21 mmHg or reduced < 20% below baseline on 2 consecutive follow-up visits after 3 months
†
IOP ≤ 5 mmHg on 2 consecutive follow-up visits after 3 months
P = 0.016 for the difference in distribution of reasons for failure between treatment groups (exact 4 × 2 permutation chi-square test)