Table 2.
Summary Statistics for Demographic and Visual Function Data Stratified by the Beckman Classification
| Stage Name | Stage Description |
Frequency (n) | Sex (% female) | Mean (± SD) |
Median (IQR) |
||
|---|---|---|---|---|---|---|---|
| Age (yrs) | BCVA (Letters) | CS (LogCS) | RMDA (min) | ||||
| Beckman 0 | No obvious aging changes | 338 | 54 | 64 (8) | 85.7 (5.9) | 1.6 (0.2) | 6.0 (4.5–8.7) |
| Beckman 1 | Normal aging changes | 29 | 52 | 69 (8) | 82.6 (12.7) | 1.5 (0.2) | 6.6 (4.7–10.5) |
| Beckman 2 | Early AMD | 20 | 75 | 66 (6) | 84.2 (4.6) | 1.5 (0.2) | 5.7 (4.4–7.4) |
| Beckman 3 | Intermediate AMD | 72 | 53 | 71 (9) | 82.0 (7.6) | 1.4 (0.2) | 13.2 (6.0–21.1) |
The main visual function measure of interest was median RMDA, indicated in bold. AMD = age-related macular degeneration; BCVA = best-corrected visual acuity; CS = contrast sensitivity; IQR = interquartile range; RMDA = rod-mediated dark adaptation; SD = standard deviation.