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 ====== Mind Your Step (MYST) ======
-Mind Your Step is the name of an [[start|additional assessment]]\\
+Mind Your Step is one of [[start|Lifelines]]' [[additional assessments]].\\
-PROTOCOL\\
+This assessment was a collaboration between Lifelines and the [[https://www.hanze.nl/eng|Hanze University of Applied sciences]], Research group [[https://www.hanze.nl/eng/research/strategic-themes/healthy-ageing|Healthy Ageing]].\\
-PERIOD
+The first goal of the assessment was to gain insight in determinants related to the adoption of two [[https://en.wikipedia.org/wiki/Quantified_self|quantified self]]-devices: a digital weight scale and an activity tracker which could also measure sleeping behavior.\\
+The second goal was to assess to what extent a change in self-regulation capabilities can explain weight loss after 4 and 12 months of self-tracking.\\
+===== Protocol =====
+The project took place between April 2016 and April 2017.\\
+Participants (>25 years old) were invited to use a digital weight scale and an activity tracker.
+The devices were connected to a smartphone application, in which the user could see his or her own data and changes in these data over time.\\
+All of the participants participated in the study for one year. They filled out a digital questionnaire at the beginning of the study, after 4 months, and after 12 months. One questionnaire included possible determinants for adoption and effect of self-tracking devices (like personal variables, self-regulation for health, and motivation towards self-tracking). \\
+In addition, participants were asked to fill out an evaluation questionnaire about the usage, effect, and experience with the devices.
+There was a restriction on number of participants because there were 100 activity trackers available.
 ===== Subcohort =====
-MYST was performed in [...] [[cohort|participants]].
+ participants between 25 and 65 years old were invited to be screened for participation.
-The selection criteria were the following:
+participants were included in the final study.\\
+The response rate:
+  * 85% (n=80) filled out the baseline questionnaire and installed both devices
+  * 77% (n=73) completed T1 questionnaire (after 4 months)
+  * 62% (n=46) completed T2 evaluation questionnaire (after 12 months)
 ===== Variables =====
-The following variables were collected:
+The questionnaires included questions about intention to start with self-tracking, and intention to change weight, sleeping behavior and physical activity behavior. In addition, attitude, self-efficacy and social norm towards self-tracking, [[self-regulation]] for health and [[subjective health (general)|perceived health]] were measured.\\
+Weight and self-weighing frequency were calculated using the weight self-measurements the participants conducted.\\
+After 4 and 12 months of self-tracking, the participants filled out an evaluation questionnaire in which they could indicate their experiences with the devices, and whether they had changed their physical activity behavior and eating habits.\\
+===== Findings =====
+Most participants were satisfied with the self-tracking devices, although the usage of the devices declined over time. Usage of the weight scale stabilized after 3 months of self-tracking.\\
+The Pulse activity tracker gave some technical problems, like a short battery life, and was therefore replaced until 6 months after the start of the study in at least 30 participants. Thereafter, no replacement was possible due to a restricted availability of the tracker.\\
+About 40% of the participants indicated to have changed their eating habits, and 60% indicated to have increased their physical activity behavior.\\
+On average, the participants lost 2 kg after 4 months, which was remained after 12 months. An increase in self-regulation capabilities (goal-orientation after 4 months and decision-making after 12 months) explained this weight loss, next to intention to change weight and self-weighing frequency.\\
+===== Publications using MYST data =====
+  * Kooijman, TJM et al. (2020) The role of self-regulation in the effect of self-tracking of physical activity and weight on BMI. Journal of Technology in Behavioral Science (in press).