Swedish Translation and Cultural Adaptation of the Head and Neck Patient Symptom Checklist: An Instrument to Screen for Nutrition Impact Symptoms in Clinical Practice and Research.

Background: The Head and Neck Patient Symptom Checklist (HNSC) is a validated 2-part instrument used to ask patients with head and neck cancer about the nutrition impact symptoms they experience (part 1) and how these interfere with their eating (part 2).

Purpose: The purpose of this work was to translate and culturally adapt the HNSC into Swedish in accordance with the guidelines of the International Society for Health Economics and Outcomes Research (ISPOR).

Methods: The ISPOR guidelines include 10 steps, and these were thoroughly followed. In step 7, 9 health care professionals from the field of head and neck cancer assessed the perceived relevance (content validity) of each item in the HNSC, as well as the full HNSC. A total of 522 participants with head and neck cancer were included and followed up on 7 occasions using the HNSC to assess internal consistency.

Results: The HNSC was translated from English into Swedish, ensuring accuracy through forward and backward translation and harmonization in the research team. Content validity for each part of the HNSC was rated excellent (scale content validity index 0.96). Internal consistency demonstrated a good Cronbach's alpha score (>0.8) across the 7 follow-up time points (from baseline [before the start of treatment] and up to 24 months posttreatment).

Conclusions: The HNSC has been successfully translated and culturally adapted into Swedish. The HNSC can be used in both clinical practice and research to screen for nutrition impact symptoms and symptoms that interfere with eating in patients with head and neck cancer.

Trial registration: ClinicalTrials.gov NCT03343236 (date of registration: November 17, 2017).