The timing of when to start therapy has continued to be a core controversy within the medical community, though recent studies have led to more clarity. The NA-ACCORD study observed patients who started antiretroviral therapy either at a CD4 count of less than 500 versus less than 350 and showed that patients who started ART at lower CD4 counts had a 69% increase in the risk of death. In 2015 the START and TEMPRANO studies both showed that patients lived longer if they started antiretrovirals at the time of their diagnosis, rather than waiting for their CD4 counts to drop to a specified level.