1. Prevalence of radiographic knee osteoarthritis and its association with knee pain in the elderly of Japanese population-based cohorts: The ROAD study 
S. Muraki, H. Oka, T. Akune, A. Mabuchi, Y. En-yo, M. Yoshida, A. Saika, T. Suzuki, H. Yoshida, H. Ishibashi, S. Yamamoto, K. Nakamura, H. Kawaguchi, N. Yoshimura 
Osteoarthritis and Cartilage 
Volume 17, Issue 9, Pages (September 2009)
DOI: /j.joca
Copyright © 2009 Osteoarthritis Research Society International Terms and Conditions

2. Fig. 1
(A) Percentage of subjects with radiographic knee OA (KL≥2 or KL≥3) in each age stratum (<65, 65–69, 70–74, 75–59 and ≥80). (B) Percentage of subjects with knee pain and radiographic knee OA (KL≥2 or KL≥3) with pain in each age stratum. The number of subjects in each age stratum is shown in parentheses.
Osteoarthritis and Cartilage  , DOI: ( /j.joca )
Copyright © 2009 Osteoarthritis Research Society International Terms and Conditions

3. Fig. 2
Percentage of subjects with knee pain in each subgroup classified by the KL grade in the overall population and communities. The number of subjects in each subgroup is shown under the bars.
Osteoarthritis and Cartilage  , DOI: ( /j.joca )
Copyright © 2009 Osteoarthritis Research Society International Terms and Conditions