Table 1. Baseline characteristics

Stage 2Stage 3Stage 4
GFR 60 to 89 + Proteinuria (n = 1741)Controls (n = 1741)GFR 30 to 59 (n = 11,278)Controls (n = 11,278)GFR 15 to 29 (n = 777)Controls (n = 777)
Mean age at index (SD)60.8 (14.9)60.4 (14.9)71.6 (11.9)71.3 (11.9)73.6 (13.6)73.6 (13.6)
Percent male56.5%56.5%37.8%37.8%35.9%35.9%
Mean mo of observation, total (SD)49.8 (17.9)52.3 (21.1)51.1 (16.5)53.1 (20.2)37.6 (20.6)52.9 (20.1)