An examination of the CDC 1994 criteria applied to several hundred patients found that the diagnosis could be strengthened by adding two new symptoms (anorexia and nausea) and eliminating three others (muscle weakness, joint pain, sleep disturbance).
Ispitivanje CDC 1994 kriterija odnosilo se na nekoliko stotina pacijenata kod kojih se našlo da dijagnoza može biti pojačana dodavanjem dva nova simptoma (anoreksija i mučnina) i eliminacijom tri druga (slabost mišića, bol u zglobovima, poremećaji spavanja).