TABLE 1.
Baseline Descriptive Statistics of the 79,332 IRIS Registry LTP Responder Eyes
| Variables | n (%) | |
|---|---|---|
| Age | ||
| 18-39 | 928 (1.2) | |
| 40-64 | 19,237 (24.3) | |
| 65-79 | 37,715 (47.5) | |
| 80+ | 21,090 (26.6) | |
| Unknown/missing | 362 (0.5) | |
| Sex | ||
| Male | 36,883 (46.5) | |
| Female | 42,222 (53.2) | |
| Unknown | 227 (0.3) | |
| Race | ||
| Asian | 1530 (1.9) | |
| Black | 9487 (12.0) | |
| Unknown | 5779 (7.3) | |
| White | 51,143 (64.5) | |
| Hispanic | 3810 (4.8) | |
| Other/multiracial | 7583 (9.6) | |
| Insurance | ||
| Dual Medicaid and Medicare | 10,196 (12.9) | |
| Medicaid | 1761 (2.2) | |
| Medicare advantage | 9140 (11.5) | |
| Medicare fee-for-service | 35,036 (44.2) | |
| Military | 491 (0.6) | |
| Other government | 131 (0) | |
| Private | 16,519 (20.8) | |
| Unknown/no payment listed | 6058 (7.6) | |
| Region | ||
| Midwest | 18,255 (23.0) | |
| Northeast | 14,153 (17.8) | |
| South | 30,910 (39.0) | |
| West | 14,258 (18.0) | |
| Unknown | 1756 (2.2) | |
| Diabetes | ||
| Yes | 14,546 (18.3) | |
| Hypertension | ||
| Yes | 3.1 | |
| LTP type | ||
| Single | 77,354 (97.5) | |
| Double | 1978 (2.5) | |
| Angle recession | ||
| Yes | 46 (0.1) | |
| Uveitis | ||
| Yes | 552 (0.7) | |
| Prior glaucoma procedure | ||
| Yes | 1463 (1.8) | |
| Prior lens surgery | ||
| Yes | 4978 (6.3) | |
| Prior intravitreal injection/surgery | ||
| Yes | 2254 (2.8) | |
| Provider status | ||
| Group 1 | 16,118 (20.3) | |
| Group 2 | 33,601 (42.4) | |
| Group 3 | 28,406 (35.8) | |
| No provider information | 1207 (1.5) | |
| Provider LTP count per year | ||
| 50 or fewer | 30,204 (38.1) | |
| 51-99 | 15,812 (19.9) | |
| 100-499 | 30,175 (38.0) | |
| 500 or more | 3141 (4.0) | |
| Glaucoma type | ||
| Glaucoma suspect | 15,850 (20.0) | |
| POAG | 56,457 (71.2) | |
| Trauma/other eye disorders | 408 (0.5) | |
| Inflammation/drugs | 297 (0.4) | |
| Other glaucoma | 172 (0.2) | |
| Unspecified glaucoma | 6148 (7.8) | |
| Severity | ||
| Mild | 13,442 (16.9) | |
| Moderate | 17,566 (22.1) | |
| Severe | 11,434 (14.4) | |
| Indeterminate | 2065 (2.6) | |
| Missing/unspecified | 12,655 (16.0) | |
| Not applicable | 22,170 (28.0) | |
| Lens status | ||
| Cataract | 25,505 (32.2) | |
| Pseudophakia | 4042 (5.1) | |
| Aphakia | 219 (0.3) | |
| Unknown | 49,566 (62.5) | |
| Mean (SD) | Minimum-maximum | |
| Baseline Intraocular pressure (mmHg) | 21.6 (5.3) | 4-68 |
| Baseline visual acuity (logMAR) | 0.23 (0.3) | −0.12 to 2.00 |
| Baseline number of glaucoma medications* | 2.1 (1.5) | 0-7 |
| Age (y) | 71.5 (11.8) | 18-99 |
Only 1 eye per patient is included.
*
Fixed-dose combination medications were counted as the number of their constituents.
IRIS indicates Intelligent Research In Sight; LogMAR, logarithm of minimum angle of resolution; LTP, laser trabeculoplasty; POAG, primary open angle glaucoma.