Fig. 1
From: Validation of a digital food frequency questionnaire for the Northern Sweden Diet Database
Flow of participants and recording quality. (A) participant flow chart; (B) proportion (%) missing answers across study participants, (C) across the 108 FFQ2020 questions, and (D) classification by a three-tiered level exclusion score used in NSDD where participants in exclude level 0 have < 10% missing answers and complete portion size indications, in exclude level 1 have ≥10% missing answers and complete portion size indications, and those in exclude level 2 lack ≥1 portion size indication