Prospective evaluation of patient reported swallow function with the Functional Assessment of Cancer Therapy (FACT), MD Anderson Dysphagia Inventory (MDADI) and the Sydney Swallow Questionnaire (SSQ) in head and neck cancer patients.

•Measuring long term treatment toxicities in Head and Neck Cancer (HNC) is crucial.•Common patient reported outcome (PRO) forms include the MDADI, SSQ, and FACT.•No universal PRO exists but we show high correlations between some instruments.•Clustering and principal component analysis (PCA) reveal 3 distinct toxicity groups.•PCA suggests redundancy in MDADI and FACT but complementary data from SSQ.