Among the most significant findings of SUPPORT was that 50% of ICU patients suffered from moderate to severe pain during the last days of life. At the time of its publication late in 1995, SUPPORT was merely the latest in a long series of articles in the medical literature documenting the widespread and significant undertreatment of pain, beginning with a 1973 study of hospital inpatients. Much has been written about the phenomenon of undertreated pain and inadequate care of patients at the end of life, and many positive suggestions for reform of clinical education and clinical practice have been iterated and reiterated in the two decades separating the studies. Proposals for modifying clinician behaviors in this aspect of patient care have tended to focus on particular barriers to effective pain management and palliative care.