To assist in the development of treatment trials and therapies. The CRIC Study initially enrolled over 3900 people with CKD who remain in long-term follow-up. Beginning in 2013, an additional 1500 people with CKD are being invited to join the study with an emphasis on older Americans. The focus of the study has been expanded to include early forms of CKD and the broad impact of CKD on health status. Learn more about collaborating with CRIC. 2014 Chronic Renal Insufficiency Cohort Study Site Map.