Validating high-frequency deployment of the Diet Quality Questionnaire

The study aimed to validate the capacity of mobile-phone-based deployment of the DQQ for generating high-frequency, reliable, and cost-effective diet quality data. The DQQ represents a versatile and validated tool for monitoring diet quality. This versatility would be strengthened if evidence outlined that deployment across multiple data collection approaches yielded equally reliable and accurate data.

The study assessed how the modality of DQQ collection affects participants’ responses. It used benchmark responses collected by mobile self-administration against face-to-face interviews, 24-hour recall, and a recorded observational method of consumption – the weighed food record.