Effect of Posture on Recall of Health Information from a Vaping Website

Manipulation of participants posture while seated (upright, seated posture compared to slumped, seated posture). Intervention condition: Upright, seated posture. Participants randomly allocated to the intervention group will be covertly manipulated into an upright, seated posture while viewing a vaping safety website by adjusting the position of the laptop they are watching the video on. In the intervention condition the laptop will be positioned on a table-top stand so that the screen height is level with the participants eye level, which will endow participants to sit with a straighter back, reducing their head and neck angle. This method for covertly manipulating participants seated posture has been implemented successfully in prior research (Muller et al., 2023). Intervention location - Clinic room at the University of Auckland Faculty of Medical and Health Sciences Clinical Research Centre Intervention Materials - The Vaping website that participants will view has been sourced from Healthify He Puna Waiora website produced by Health Navigator Charitable Trust. The Healthify website provides the New Zealand public with access to up-to-date, accurate and evidenced-based health information and self-help resources produced and maintained by experienced medical writers and clinical advisors. Healthify He Puna Waiora is currently endorsed by the Royal New Zealand College of General Practitioners as an online healthcare information resource which is broad, accessible and well informed and researched. The specific Webpage that will be used in the study is titled "Vaping" and can be sourced through this link (https://healthify.nz/hauora-wellbeing/v/vaping/). Intervention Delivery - Participants will be given specific verbal instructions about what sections of the Vaping webpage they are expected to review and which sections of the website are referenced within the short-answer knowledge quiz they will be completing after interacting with the website. The Healthify Vaping website consists of several expandable tabs each labelled with a subtitle and participants will be instructed to read and watch the material from the first tab subtitled, What is vaping?" through to the tab subtitled, "Side effects of vaping." The researcher will highlight that the second tab subtitled, "VIDEO: A Spotlight on Vaping series" includes an embedded video and that the content in the video may be included in the short-answer knowledge quiz and so should be included also. Participants will be told that they may navigate through the content specified in whatever order they please and that they may view the website material for as long as they desire before informing the researcher that they have finished viewing the website. Intervention frequency and duration - The intervention involving exposure to the website will take place once only. While participants may view the website for as long as they wish to, it is expected that for most participants this will take 10 to 15 minutes based on mock intervention rehearsals conducted by the research team. The post-intervention questionnaire which will included a free-recall task, short-answer quiz and RABE questionnaire and VAS measure is expected to take 5 to 10 minutes based off mock trial rehearsals conducted within the research team. Adherence Monitoring - In order to assess the effectiveness of the posture manipulation the intervention will be video recorded with participant consent. The video recording of the intervention will also be used to measure how long participants interact with the website and monitor participants website viewing behaviour (e.g do they view all specified tabs, do they watch the embedded video in full, are there sections that they navigate back to and review). Participants will be told that the purpose of the video recording is for the researchers to be able to review how participants interact with the website and to ensure that participants have in fact read through and watched all content they have bene instructed to. Additionally, the researcher conducting the study will be present in the room to facilitate the study, provide instructions and answer participant questions, and to troubleshoot any technical issues which may arise. The researcher will also be able to covertly monitor that participants are engaging in the intervention in real time as they will be in the room with the participant throughout the study duration.