Univariate analyses for association between optic disc characteristics and grey crescent among patients with glaucoma
| Grey crescent present (N=284 eyes) | Grey crescent absent (N=2582 eyes) | P value | |
| Disc shape, n (%) | 0.75 | ||
| Round | 125 (44.2) | 1162 (45.3) | |
| Oval | 158 (55.8) | 1405 (54.7) | |
| Unknown | 1 | 15 | |
| Shape of cup, n (%) | 0.17 | ||
| Conical | 119 (43.6) | 934 (38.0) | |
| Cylindrical | 122 (44.7) | 1153 (46.9) | |
| Bean | 32 (11.7) | 372 (15.1) | |
| Unknown | 11 | 123 | |
| Stereoscopically identified disc tilt, n (%) | <0.0001 | ||
| No | 189 (68.2) | 2080 (84.0) | |
| Yes | 88 (31.8) | 397 (16.0) | |
| Unknown | 7 | 105 | |
| Sloping region adjacent to the outer disc margin, n (%) | <0.0001 | ||
| No | 159 (57.8) | 1855 (74.8) | |
| Yes | 116 (42.2) | 625 (25.2) | |
| Unknown | 9 | 102 | |
| Visible pores in lamina cribrosa, n (%) | 0.42 | ||
| No | 79 (27.8) | 772 (30.3) | |
| Yes | 205 (72.2) | 1776 (69.7) | |
| Unknown | 0 | 34 | |
| Vessel bayonetting, n (%) | 0.71 | ||
| No | 104 (36.6) | 976 (37.8) | |
| Yes | 180 (63.4) | 1606 (62.2) | |
| Cilioretinal vessels, n (%) | 0.28 | ||
| No | 215 (75.7) | 2018 (78.6) | |
| Yes | 69 (24.3) | 551 (21.4) | |
| Unknown | 0 | 13 | |
| Pallor of disc, n (%) | 0.21 | ||
| No | 275 (97.2) | 2463 (95.6) | |
| Yes | 8 (2.8) | 114 (4.4) | |
| Unknown | 1 | 5 | |
| Beta peripapillary atrophy, n (%) | 0.0001 | ||
| No | 58 (20.4) | 832 (32.4) | |
| Yes | 226 (79.6) | 1736 (67.6) | |
| Unknown | 0 | 14 |