Relationship of TDB to the morphological appearance of the filtering blebs determined based on the IBAGS
| IBAGS grade | n | TDB (°C) | p Value |
| Height (H) | |||
| 0 | 7 | 0.479 (0.434) | |
| 1 | 13 | 0.285 (0.198) | 0.2231* |
| 2 | 12 | 0.454 (0.199) | |
| 3 | 7 | 0.471 (0.152) | |
| Extent (E) | |||
| 0 | 8 | 0.438 (0.418) | |
| 1 | 9 | 0.344 (0.228) | 0.8453* |
| 2 | 15 | 0.433 (0.214) | |
| 3 | 7 | 0.386 (0.146) | |
| Vascularity (V) | |||
| 0 | 8 | 0.462 (0.173) | |
| 1 | 13 | 0.469 (0.196) | 0.3183* |
| 2 | 8 | 0.269 (0.300) | |
| 3 | 10 | 0.385 (0.321) | |
| Seidel test (S) | |||
| 0 | 33 | 0.411 (0.263) | 0.7546† |
| 1 | 6 | 0.375 (0.219) |
IBAGS, Indiana Bleb Appearance Grading Scale; TDB, temperature decrease in the filtering bleb.
Values are mean (SD).
*ANOVA; †Mann–Whitney U test.