Table 1.

Characteristics of the 853 persons in the study

Variable	Mean (s.d., min, max) or n (%)	Missing data, n
Demographic
Age in years, mean (s.d.)	64.7 (8.9, 45, 83)	0
Female, total (%)	433 (50.8)	0
Race, total (%)		0
Other non-white	20 (2.3)
White or Caucasian	660 (77.4)
Black or African American	167 (19.6)
Asian	6 (0.7)
Comorbidity score, mean (s.d.)	0.49 (1.0, 0, 12)	12
BMI, mean (s.d.)	29.9 (4.7, 18.2, 48.7)
Sub-cohort at baseline, total (%)
Incidence	353 (41.4)
Progression	500 (58.6)
Self-reported function and performance
WOMAC Physical Function Score, mean	15.6 (12.3, 0, 67)	11
KOOS QOL Score, mean (s.d.)	55.4 (20.0, 0, 100)
KOOS Function, Sports and Recreational Activities	59.0 (25.3, 0, 100)	322
20-m walk pace, m/s	1.28 (0.22, 0.32, 2.02)	18
400-m walk, s	317.6 (62.3, 57.9, 685.9)	52
Repeated chair stand, stands/s	0.48 (0.14, 0.14, 1.14)	66