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. Author manuscript; available in PMC: 2010 Oct 1.
Published in final edited form as: Osteoarthritis Cartilage. 2009 Apr 22;17(10):1307–1312. doi: 10.1016/j.joca.2009.04.010

Table 1.

The distribution of the number of images, gender ratio, mean age and mean difference between the initial and follow-up classification

KL Grade 0 KL Grade 1 KL Grade 2 KL Grade 3
No. of images 84 51 25 39
Men/Women 0.64 0.62 0.59 0.61
Mean age (years) 52 48.7 49.5 52
Mean difference (years) 21.5 21.8 20.6 21.2