Demographic characteristics and fundus conditions of 4795 participants in Chinese primary healthcare settings
| Variable | Total (n=4795) | Shanghai (n=2528) | Xinjiang (n=2267) | P value |
| Age (years) | 57 (39.0, 66.0) | 64 (55.0, 70.0) | 44 (32.0, 56.0) | <0.001* |
| Gender | <0.001* | |||
| Female | 3175 (66.2) | 1874 (74.1) | 1301 (57.4) | |
| Male | 1620 (33.8) | 654 (25.9) | 966 (42.6) | |
| Normal fundus | 515 (10.7) | 62 (2.5) | 453 (20.0) | <0.001* |
| Referable diabetic retinopathy | 386 (8.1) | 211 (8.3) | 175 (7.7) | 0.426 |
| Referable hypertensive retinopathy | 8 (0.2) | 3 (0.1) | 5 (0.2) | 0.488 |
| Glaucomatous optic neuropathy | 572 (11.9) | 394 (15.6) | 178 (7.9) | <0.001* |
| Pathological myopia | 496 (10.3) | 471 (18.6) | 25 (1.1) | <0.001* |
| Retinal vein occlusion | 57 (1.2) | 14 (0.6) | 43 (1.9) | <0.001* |
| Retinal detachment | 0 (0) | 0 (0) | 0 (0) | / |
| Macular holes | 17 (0.4) | 12 (0.5) | 5 (0.2) | 0.139 |
| Macular oedema | 237 (4.9) | 79 (3.1) | 158 (7.0) | <0.001* |
| Central serous chorioretinopathy | 7 (0.1) | 6 (0.2) | 1 (0.0) | 0.129 |
| Epiretinal membranes | 318 (6.6) | 242 (9.6) | 76 (3.4) | <0.001* |
| Retinitis pigmentosa | 16 (0.3) | 2 (0.1) | 14 (0.6) | 0.001* |
| Retinal drusen | 293 (6.1) | 266 (10.5) | 27 (1.2) | <0.001* |
| Macular neovascularisation | 64 (1.3) | 55 (2.2) | 9 (0.4) | <0.001* |
| Geographic atrophy | 5 (0.1) | 5 (0.2) | 0 (0) | 0.064 |
Data are presented as median (IQR) or n (%).
*Statistically significant.