Table 1.
Comparison of demographic features between the present study and 4 other published studies
| Parameters | Present | Cui [1] | Chen [11] | Yuan [9] | Guan [10] |
|---|---|---|---|---|---|
| Location | Central China | Southern China | Southern China | Northern China | Eastern China |
| Eyes/patients | 3209/2821 | 6750/4561 | 4831/2849 | 12,449/6908 | 1430/827 |
| Age (y) | |||||
| Mean ± SD | 70.51 ± 9.81 | 70.4 ± 10.5 | 70.56 ± 9.55 | 69.80 ± 11.15 | 72.27 ± 11.59 |
| Range | 32, 95 | 40, 101 | 40, 95 | 30, 97 | 16, 98 |
| Male/female | 1071/1750 | 2026/2535 | 1090/1759 | 3199/3709 | 359/468 |
| Keratometry (D) | |||||
| Mean ± SD | 1.09 ± 0.77 | 0.90(Median) | 1.01 ± 0.69 | 1.15 ± 0.84 | 1.07 ± 0.73 |
| Range | 0.0, 6.21 | NR | 0.05, 6.59 | 0.0, 6.63 | 0.06, 5.52 |
| K1 mean ± SD | 43.75 ± 1.59 | 43.57 ± 1.69 | 43.76 ± 1.53 | 43.93 ± 1.67 | 43.57 ± 1.56 |
| K2 mean ± SD | 44.84 ± 1.65 | 44.69 ± 1.69 | 44.76 ± 1.56 | 45.08 ± 1.73 | 44.64 ± 1.65 |
| K mean ± SD | 44.29 ± 1.58 | 44.13 ± 1.63 | NR | NR | NR |
| Corneal astigmatism (%) | |||||
| ≤ 0.5D | 21.19% | NR | 23.14% | 20.76% | 21.2% |
| ≥ 1.0D | 43.85% | 43.9% | 41.3% | 47.27% | 45.46% |
| ≥ 2.0D | 10.56% | 11.6% | 8.22% | 13.16% | 10.42% |
| ≥ 3.0D | 2.80% | 3.4% | 1.68% | 3.75% | 2.31% |
| axis | 88.82 ± 49.63 | NR | NR | NR | NR |
| AL (mm) | 24.38 ± 2.47 | 24.07 ± 2.14 | 23.58 ± 1.13 | NR | NR |
| ACD (mm) | 3.15 ± 0.48 | 3.01 ± 0.57 | NR | NR | NR |
| WTW (mm) | 11.63 ± 0.43 | 11.68 ± 0.45 | NR | NR | NR |
D diopter, K1 flat keratometry, K2 steep keratometry, K mean keratometry, SD standard deviation, AL axial length, ACD anterior chamber depth, WTW white to white, NR not reported