2. Value of connected health data for research?
Withings devices collect rich longitudinal (weight) data on self-selected individuals.
What is the value of these data for research?
How does the self-selected population compare with wider population?
What drives repeated engagement with technology?

3. Self-weighing scales in action

5. Baseline Comparison with Population
Who self-weighs?
UK Withings smart-scale users vs. Health Survey for England (2011)
Slimmer women use smart-scales
Fatter men use smart-scales
Women point-estimate = [95% CI: -2.22,-1.03]
Men point-estimate = 1.26 [95% CI: 0.84,1.69]
Difference in Mean BMI

6. Detailed analysis of weight change data
Who self-weighs?
UK Withings smart-scale users vs. Health Survey for England (2011)
Weight Loss
An additional monthly weighing is associated with an extra 1kg weight lost over the course of a year
Recent weight loss encourages subsequent measurement: a person who has recently lost 1kg is twice as likely to reweigh on a given day compared with someone who has remained the same weight
Engagement

7. Future collaboration
Data sharing – source of rich longitudinal data to understand (weight) change over time.
Other measures – e.g. BP, steps/day…
Messy observation process – ‘informative measurement’
Use of Withings devices in connected health projects.