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. 2022 Jul 20;2(4):100204. doi: 10.1016/j.xops.2022.100204

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.