The degree of OM is assessed at eight intraoral locations, in accordance with the Oral Mucositis Assessment Scale (OMAS) (graded 0-3 for ulceration and 0-2 for erythema). 0 corresponds to "normal" while 3 and 2 are "sore >3 cm2" and "severe erythema" respectively. The assessment generates both an average for OMAS ulceration (0-3) and OMAS erythema (0-2) and a total average OMAS (0-5), which is the mean of both ulceration and erythema.