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. 2018 Feb 7;15(2):288. doi: 10.3390/ijerph15020288

Table 3.

Design suggestions for personal CO monitoring devices and associated apps.

Theme 4 Personal CO Monitor: Features and Qualities
4.1.–4.2.

  • Small size and light weight

  • Wireless connection

  • Rechargeable batteries

  • Possibility to take CO test and temporarily store results without needing to connect to smartphone for each individual test

  • Possibility to display the result on the device

  • Option of different colors

  • Case provided to fit all necessary items (e.g., cables)
Theme 5 App: Features and Qualities
5.1. CO testing and display of CO results
5.1.1. CO testing journey

  • Immediately accessible on app launch

  • Quick and easy testing procedures

  • Clear presentation of a numeric result (in ppm)
5.1.2. Feedback on CO results

  • Presentation of the result on the scale or color-coded

  • Relevant feedback (e.g., health impact)

  • Encouraging advice on lowering the CO levels
5.1.3. Recording contextual data

  • Possibility to collect contextual data on CO readings (e.g., timing and number of cigarettes smoked, levels of urges and stress)
5.2. Interactive infographics

  • Long-term record of CO results

  • Interactive display (zooming in/out, changing time scales)

  • Displaying CO results against targets and thresholds

  • Displaying CO results together with contextual data recorded
5.3. Factual content

  • Information and advice on CO and CO testing,

  • Advice on quitting and cutting down, managing CO levels
5.4. Additional features

  • Customizable reminders to take CO tests

  • Possibility to set targets and goals for CO levels

  • Rewards for reaching targets (in-app or external, e.g., diplomas)

  • Sharing CO results on social media or with selected persons

  • Multimedia demonstrating CO testing procedure
5.5. External expert support

  • Possibility to contact a healthcare professional when concerned

  • Possibility to share CO results with clinicians as part of quitting

  • Integration with traditional cessation interventions
5.6. General app qualities and Information architecture

  • Key and interesting information presented in bite-sized, short communications at different stages of the app

  • Longer text (e.g., advice) available for optional browsing

  • Skippable content and options to re-visit content

  • Use of visuals and imagery to convey information or feedback

  • Imagery and colors friendly for visually-impaired users
5.7. Onboarding and registration

  • Registering with personal details for the study, with option to remain anonymous for commercial use

  • Creating detailed profile supporting personalization

  • Tutorial with key information and advice on CO, CO testing and app use presented at the start, but available on request