Figure 1 .
Plots of (A) semiquantitative analysis with digital image analysis of 20 high power fields (HPF) in one single region; (B) digital image analysis of 20 high power fields (HPF) in three regions with 20 high power fields (HPF) each (total 60 HPF); and (C) the difference between the two digital image analyses with the average between the two techniques as suggested by Bland and Altman.12 Depicted are the semiquantitative score on a five point scale and the integrated optical density (IOD) for interleukin 1β staining in synovial tissue of all subjects studied and the Spearman correlation coefficient (rs).