Figure 1:

Association of morning stiffness severity and duration with disease activity

A. Frequency of patients reporting any morning stiffness stratified by DAS28 score severity. B. Duration of morning stiffness stratified by DAS28 score severity. C. Severity of stiffness stratified by DAS28 score severity. D. Distribution of responses to questions regarding duration of morning stiffness and severity of stiffness. Each dot represent one patient response. The black dots represent the 43% of patients with discordant responses (less than one hour of morning stiffness but stiffness severity ≥6/10). P values represent results of chi-squared (A) and Kruskal-Wallis (B and C) tests.