Table 2a. Comparison of patient demographics.
| Parameter |
Study for comparison (first author) |
|||
|---|---|---|---|---|
| This study | Ferrer-Blasco10 | Chen9 | Guan1 | |
| Eyes (n) | 2247 | 4540 | 4831 | 1430 |
| Patients (n) | 2247 | 2415 | 2849 | 827 |
| Age (years) | ||||
| Mean±SD | 72.28±13.84 | 60.59±9.87 | 70.56±9.55 | 72.27±11.59 |
| Range | 10, 109 | 32, 87 | 40, 95 | 16, 98 |
| Astigmatism (D) | ||||
| Mean±SD | 1.11±0.88 | 0.90±0.93 | 1.01±0.69 | 1.07±0.73 |
| Range | 0.02, 13.71 | 0.25, 6.75 | 0.05, 6.59 | 0.06, 5.52 |
| K1 (D) | ||||
| Mean±SD | 43.18±1.64 | 43.48±1.61 | 43.76±1.53 | 43.57±1.56 |
| Range | 32.19, 48.98 | — | — | 38.09, 51.76 |
| K2 (D) | ||||
| Mean±SD | 44.29±1.70 | 44.08±1.59 | 44.76±1.56 | 44.64±1.65 |
| Range | 36.97, 52.53 | — | — | 39.61, 52.98 |
Abbreviations: K1, flat keratometry, K2, steep keratometry.