Table 1.
Univariate Risk Factor Assessment for Primary and Sequential Glaucoma Drainage Device Exposure
| Risk Factor | Number of Primary Drainage Devices (% of total) |
Number of Primary Device Exposures (% of group) |
p-value* | Number of Sequential Devices (% of Total) |
Number of Sequential Device Exposures (% of Group) |
p-value* | |
|---|---|---|---|---|---|---|---|
| Age at Surgery | 0.4397 | 0.9222 | |||||
| ≤ 61 | 362 (51.6%) | 20 (5.5%) | 33 (54.1%) | 5 (15.2%) | |||
| > 61 | 340 (48.4%) | 21 (6.2%) | 28 (45.9%) | 3 (10.7%) | |||
| Gender | 0.7828 | 0.5694 | |||||
| Female | 384 (54.7%) | 22 (5.7%) | 34 (55.7%) | 5 (14.7%) | |||
| Male | 318 (45.3%) | 19 (6.0%) | 27 (44.3%) | 3 (11.1%) | |||
| Racea | 0.3269 | 0.8197 | |||||
| African American | 333 (50.8%) | 21 (6.3%) | 31 (55.4%) | 3 (9.7%) | |||
| White | 288 (44.0%) | 15 (5.2%) | 24 (42.9%) | 4 (16.7%) | |||
| Hispanic | 13 (2.0%) | 2 (15.4%) | 1 (1.8%) | 0 (0.0%) | |||
| Asian | 13 (2.0%) | 0 (0.0%) | 0 (0.0%) | 0 (0.0%) | |||
| Other | 8 (1.2%) | 0 (0.0%) | 0 (0.0%) | 0 (0.0%) | |||
| Modela | 0.7576 | 0.8575 | |||||
| Ahmed FP7 | 345 (51.0%) | 13 (3.8%) | 35 (58.3%) | 5 (14.3%) | |||
| Baerveldt | 219 (32.4%) | 14 (6.4%) | 18 (30.0%) | 2 (11.1%) | |||
| Ahmed S2 | 107 (15.8%) | 10 (9.4%) | 7 (11.7%) | 1(14.3%) | |||
| Other | 6 (0.9%) | 0 (0.0%) | 0 (0.0%) | 0 (0.0%) | |||
| Implant Location | 0.0698 | 0.4730 | |||||
| Superior-temporal | 653 (93.0%) | 36 (5.5%) | 6 (9.8%) | 1 (16.7%) | |||
| Inferior-nasal | 29 (4.1%) | 5 (17.2%) | 25 (41.0%) | 5 (20.0%) | |||
| Inferior-temporal | 10 (1.4%) | 0 (0.0%) | 20 (32.8%) | 2 (10.0%) | |||
| Superior-nasal | 10 (1.4%) | 0 (0.0%) | 10 (16.4%) | 0 (0.0%) | |||
| Implant Location | 0.0560 | 0.2761 | |||||
| Superior | 663 (94.4%) | 36 (5.4%) | 16 (26.2%) | 1 (6.3%) | |||
| Inferior | 39 (5.6%) | 5 (12.8%) | 45 (73.8%) | 7 (15.6%) | |||
| Patch Grafta | 0.0720 | 0.9718 | |||||
| Pericardium | 381 (55.1%) | 30 (7.9%) | 23 (37.7%) | 4 (17.4%) | |||
| Sclera | 209 (30.2%) | 1 (0.5%) | 10 (16.4%) | 1 (10.0%) | |||
| Cornea | 98 (14.2%) | 9 (9.2%) | 26 (42.6%) | 3 (11.5%) | |||
| Other | 4 (0.6%) | 0 (0.0%) | 2 (3.3%) | 0 (0.0%) | |||
| Glaucoma Typea | 0.9539 | 0.7268 | |||||
| Open angle | 182 (26.1%) | 11 (6.0%) | 18 (29.5%) | 1 (5.6%) | |||
| Inflammatory | 144 (20.6%) | 8 (5.6%) | 8 (13.1%) | 1 (12.5%) | |||
| Chronic angle closure | 136 (19.5%) | 8 (5.9%) | 18 (29.5%) | 2 (11.1%) | |||
| Neovascular | 102 (14.6%) | 5 (4.9%) | 8 (13.1%) | 2 (25.0%) | |||
| Traumatic | 44 (6.3%) | 4 (9.1%) | 4 (6.6%) | 1 (25.0%) | |||
| Other | 90 (12.9%) | 5 (5.6%) | 5 (8.2%) | 1 (20.0%) | |||
| Prior surgeriesa | 0.8667 | 0.9338 | |||||
| 0 | 121 (18.2%) | 7 (5.8%) | |||||
| 1 | 221 (33.2%) | 11 (5.0%) | 5 (9.4%) | 0 (0.0%) | |||
| 2 | 201 (30.2%) | 12 (6.0%) | 13 (24.5%) | 3 (23.1%) | |||
| 3 | 77 (11.6%) | 5 (6.5%) | 21 (39.6%) | 3 (14.3%) | |||
| 4+ | 46 (6.9%) | 4 (9.5%) | 14 (26.4%) | 2 (14.2%) | |||
*
The p-value is for the log-rank test comparing the time-to-exposure curves among the categories of the corresponding risk factor.
a
There were a small number of cases in which the required information could not be determined from the medical records. For these characteristics, the analyzed sample is less than the total sample.