Table 1. Subject demographics.

Median age at start of follow-up	67.3 years (IQR 60.7–75.6)a
Median age at end of follow-up	75.0 years (IQR 67.7–82.2)
Median number of VF tests	6 (IQR 5–8)
Median duration of follow-up	6.7 years (IQR 4.9–8.7)
Proportion of patients with both eyes included	1969/2208 (89%)
Best eye right	1174/2208 (53%)
Median presenting MD best eye	−2.0 dB (IQR −2.9 to 0.3)
Median presenting MD worst eye	−3.2 dB (IQR −7.3 to −0.9)

^aNegatively skewed distribution.