N | Any pterygium | Pterygium <3 mm | Pterygium ≥3 mm not reaching the pupillary margin | Pterygium ≥3 mm reaching the pupillary margin | |||||
N | Prevalence (%) (95% CI) | N | Prevalence (95% CI) | N | Prevalence (95% CI) | N | Prevalence (95% CI) | ||
Sex | |||||||||
Male | 1000 | 653 | 65.30 (60.31 to 70.29) | 418 | 41.80 (37.36 to 46.24) | 206 | 20.60 (17.44 to 23.76) | 29 | 2.90 (1.97 to 3.83) |
Female | 1041 | 546 | 52.45 (47.20 to 57.70) | 339 | 32.56 (27.92 to 37.21) | 167 | 16.04 (11.88 to 20.20) | 40 | 3.84 (2.49 to 5.20) |
Age category | |||||||||
45–54 | 790 | 448 | 56.71 (51.00 to 62.42) | 322 | 40.76 (37.32 to 44.19) | 114 | 14.43 (9.81 to 19.05) | 12 | 1.52 (0.73 to 2.30) |
55–64 | 646 | 382 | 59.13 (54.40 to 63.87) | 219 | 33.90 (30.24 to 37.56) | 137 | 21.21 (18.01 to 24.41) | 26 | 4.02 (2.64 to 5.41) |
65–74 | 351 | 234 | 66.67 (58.77 to 74.56) | 134 | 38.18 (33.06 to 43.28) | 79 | 22.51 (17.00 to 28.01) | 21 | 5.98 (3.79 to 8.18) |
≥75 | 254 | 135 | 53.15 (44.16 to 62.14) | 82 | 32.28 (26.49 to 38.07 | 43 | 16.93 (12.16 to 21.70) | 10 | 3.94 (1.27 to 6.61) |
Educational level | |||||||||
None | 237 | 150 | 63.29 (55.68 to 70.90) | 89 | 37.55 (30.21 to 44.89) | 48 | 20.25 (18.49 to 26.24) | 13 | 5.48 (3.50 to 7.47) |
<Primary | 546 | 337 | 61.72 (57.58 to 65.87) | 206 | 37.73 (34.47 to 40.98) | 106 | 19.41 (14.99 to 23.83) | 25 | 4.58 (2.90 to 6.26) |
Primary | 577 | 351 | 60.83 (53.82 to 67.85) | 212 | 36.74 (31.93 to 41.56) | 123 | 21.32 (16.74 to 25.90) | 16 | 2.77 (0.97 to 4.58) |
Secondary | 295 | 171 | 57.97 (50.98 to 64.95) | 115 | 38.98 (32.18 to 45.78) | 44 | 14.91 (10.25 to 19.58) | 12 | 4.07 (1.85 to 6.28) |
≥High school | 386 | 190 | 49.22 (42.73 to 55.71) | 135 | 34.97 (29.35 to 40.59) | 52 | 13.47 (8.82 to 18.13) | 3 | 0.78 (0.13 to 1.68) |
Residence area | |||||||||
Urban | 1180 | 651 | 55.17 (50.66 to 59.68) | 440 | 37.29 (32.93 to 41.65) | 180 | 15.25 (11.50 to 19.00) | 31 | 2.63 (1.74 to 3.51) |
Rural | 861 | 548 | 63.65 (53.22 to 74.08) | 317 | 36.82 (29.03 to 44.61) | 193 | 22.42 (19.53 to 25.30) | 38 | 4.41 (3.05 to 5.78) |
Total | 2041 | 1199 | 58.75 (53.82 to 63.67) | 757 | 37.09 (33.61 to 40.57) | 373 | 18.27 (15.25 to 21.30) | 69 | 3.38 (2.50 to 4.26) |