| | Cohort No. (%) | Eligible No. (%) | Interviewed No. (%)* | P | | 5,210 (100) | 2,329 (44.7) | 1,223 (52.5) | |
| | Gender | | | | 0.858 | | Male | 3,040 (58.3) | 1,362 (58.5) | 719 (58.8) | | | Female | 2,170 (41.7) | 967 (41.5) | 504 (41.2) | | | Age (y) | | | | | | Mean (SD) | 49.0 (19.8) | 46.8 (17.9) | 45.8 (16.9) | | | Male | 46.0 (19.2) | 44.1 (17.6) | 43.9 (16.8) | | | Female | 53.1 (19.9) | 50.4 (17.8) | 48.6 (16.6) | | | Median | 46.0 | 44.0 | 43.0 | 0.266 | | Male | 42.0 | 40.0 | 41.0 | 0.972 | | Female | 53.0 | 49.0 | 47.0 | 0.084 | | Marital status | | | | | | Married | n.c. | n.c. | 676 (57.1) | | | Single | 412 (34.8) | | | Widow | 62 (5.2) | | | Divorced | 34 (2.9) | | | Unreported | 39 | | | Education | | | | | | High school | n.c. | n.c. | 457 (39.4) | | | Secondary school | 311 (26.8) | | | Primary school | 227 (19.6) | | | Degree | 143 (12.3) | | | None | 22 (1.9) | | | Unreported | 63 | | | Working status | | | | | | Partial or full time | n.c. | n.c. | 632 (55.6) | | | Retired | 222 (19.5) | | | House keeper | 181 (15.9) | | | Student | 65 (5.7) | | | Jobless | 36 (3.2) | | | Unreported | 87 | | | Reason for graft | | | | 0.026 | | Optical | 4,183 (90.8) | 1,994 (92.5) | 1,085 (94.7) | | | Tectonic | 228 (4.9) | 84 (3.9) | 26 (2.3) | | | Pain reduction | 197 (4.3) | 78 (3.6) | 34 (3.0) | | | Unreported | 602 | 173 | 78 | | | Type of keratoplasty | | | | 0.227 | | Penetrating | 4,696 (90.1) | 2,157 (92.6) | 1,146 (93.7) | | | Anterior lamellar | 514 (9.9) | 172 (7.4) | 77 (6.3) | | | Clinical indication | | | | 0.386 | | Ectasia/thinning | 2,550 (48.9) | 1,298 (55.7) | 730 (59.7) | | | Regraft (related or not to rejection) | 674 (12.9) | 304 (13.0) | 148 (12.1) | | | Pseudophakic corneal edema | 594 (11.4) | 195 (8.4) | 87 (7.1) | | | Primary endotheliopathies | 335 (6.4) | 140 (6.0) | 82 (6.7) | | | Mechanical trauma | 174 (3.3) | 76 (3.3) | 36 (3.0) | | | Viral/postviral keratitis | 129 (2.5) | 50 (2.2) | 25 (2.0) | | | Stromal corneal dystrophy | 79 (1.5) | 35 (1.5) | 23 (1.9) | | | Aphakic corneal edema | 102 (2.0) | 30 (1.3) | 14 (1.2) | | | Optical/refractive | 67 (1.3) | 36 (1.6) | 14 (1.2) | | | Microbial/postmicrobial keratitis | 76 (1.5) | 32 (1.4) | 13 (1.1) | | | Noninfectious ulcerative keratitis | 177 (3.4) | 38 (1.6) | 10 (0.7) | | | Chemical injures | 36 (0.7) | 8 (0.3) | 3 (0.2) | | | Other (leucoma by unknown cause; silicone keratopathy; inborn opacities) | 217 (4.2) | 87 (3.7) | 38 (3.1) | | | Previous keratoplasty | | | | 0.369 | | No | 4,094 (86.1) | 1,896 (86.2) | 1,020 (87.3) | | | Yes | 663 (13.9) | 303 (13.8) | 148 (12.7) | | | Unreported | 453 | 130 | 55 | | | Previous surgery (except keratoplasty) | | | | 0.120 | | No | 3,251 (68.3) | 1,610 (73.2) | 884 (75.7) | | | Yes | 284 (31.7) | 589 (26.8) | 284 (24.3) | | | Unreported | 453 | 130 | 55 | | | Other ocular diseases | | | | 0.345 | | No | 3,700 (77.2) | 1,734 (77.0) | 939 (78.5) | | | Yes | 1096 (22.8) | 515 (23.0) | 257 (21.5) | | | Unreported | 414 | 81 | 27 | | | Systemic diseases | | | | 0.455 | | No | 3,657 (78.6) | 1,723 (77.8) | 933 (78.9) | | | Yes | 997 (21.4) | 491 (22.2) | 249 (21.1) | | | Unreported | 556 | 116 | 41 | |
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