Table 2 Overview of teacher food and Nutrition-related health and wellbeing questionnaire (TFNQ) development and methodology used

Stage One- Drafting of the initial version of the TFNQ

1.1

Review FN constructs across global teacher populations

Scoping review

Identify the range of FN constructs previously used in the peer-reviewed literature and potential gaps within teacher FN research.

1.2

Correlates and determinants of healthy eating practices in teachers

Literature search

Identify strong correlates, or FN constructs with an association of interest with dietary outcomes and mental health/wellbeing, and key determinants relevant to teachers in Australia.

1.3

The Determinants of Nutrition and Eating (DONE) Framework

Determinants of FN investigated

Framework used to guide selection of constructs and LC.

1.4

Draft questionnaire

• Collate findings steps 1.1–1.3

• Research team discussions

Development of the initial version of the TFNQ.

Stage Two- e-Delphi to evaluate the content validity of the TFNQ

2.1a

e-Delphi recruitment and participant consent

An online survey using the QuestionPro software

1. Fifty-nine invitations were sent via email with embedded survey link to obtain participant consent to participate.

Sent to participants in August 2022.

2.1b

e-Delphi round one

An online survey using the QuestionPro software

1. Assess the value of constructs and LC to obtain valuable information.

2. To establish constructs and LC for removal.

Sent to participants in September 2022, with a fortnight provided to complete

2.2

Research team review meeting/discussion

Online team meeting utilising the online meeting platform Zoom (Zoom video Communications Inc, San Jose, CA).

Considered constructs and LC with close consensus vote and/or conflicting comments. Removed and refine constructs and LC for round-two review.

All members of the research team (TJ, CEC, VAS, TB, AM) participated in a two-hour online discussion.

2.3

e-Delphi round two

An online survey using the QuestionPro software

1. Refine question phrasing.

2. Assess scale suitability.

3. Assess questionnaire flow (i.e., suggestions for construct/LC order).

Sent to participants in October 2022, with a fortnight provided to complete.