Risk factors and survival of 72 MYCN not amplified patients. Patients are divided in poor and good prognosis groups according to the NB-hypo. Columns represent individual patients. The first line represents the patients according to the International Neuroblastoma Staging System (INSS). The second line represents the patients according to the age at diagnosis (> 1 year vs. < 1 year). In the last line, the patients are divided in deceased, black squares, and alive, gray squares.