1. Prodromal symptoms in knee osteoarthritis: a nested case–control study using data from the Osteoarthritis Initiative 
R. Case, E. Thomas, E. Clarke, G. Peat 
Osteoarthritis and Cartilage 
Volume 23, Issue 7, Pages (July 2015)
DOI: /j.joca
Copyright © 2015 The Authors Terms and Conditions

2. Fig. 1
Probability of cases (solid line, diamond marker) and controls (dashed line, triangle marker) responding moderate, severe or extreme to at least 1 item in the WOMAC pain subscale at each time prior to t0 (incidence for the cases)estimated from multi-level model. The length of the prodrome is estimated as the time point where these lines cross. Data from the OAI, United States of America, 2004–2010.
Osteoarthritis and Cartilage  , DOI: ( /j.joca )
Copyright © 2015 The Authors Terms and Conditions

3. Fig. 2
Probability of cases (solid line, diamond marker) and controls (dashed line, triangle marker) responding moderate, severe or extreme to individual items at each time prior to t0 (incidence for the cases). The length of the prodrome is estimated as the time point where these lines cross. Data from the OAI, United States of America, 2004–2010.
Osteoarthritis and Cartilage  , DOI: ( /j.joca )
Copyright © 2015 The Authors Terms and Conditions