Comparison of the composition of each patient group with or without a certain subphenotype. P, patient group with a certain subphenotype; N, patient group without the subphenotype. The area of each cycle is proportional to the conditional frequency, which is the proportion of each subphenotype (upper side of figure) in a P or N group.
Zhong et al. Arthritis Research & Therapy 2011 13:R186 doi:10.1186/ar3514