The Wellbeing app collected information on emotion and self-regulation, external stressors, attachment, and interactions with loved ones. During the Wave 13 interview all respondents who had completed at least one previous interview were invited to download the app and asked to use it every evening for 14 days. Respondents were offered £1 for every day on which they completed the app survey. The data collected in the app are deposited separately with the UK Data Service (SN: 9065, 10.5255/UKDA-SN-9065-1) and can be linked to data from the annual IP interviews using the individual identifier “pidp”.
The invitation to the Wellbeing app study included a number of experiments. These are: 1) the invitation to the study placed early vs. late in the Wave 13 survey; 2) the length of the daily app survey, 2 vs. 10 minutes; 3) the bonus incentives offered for completing all 14 days of the study, Control (none) vs. £10 for all 14 days completed vs. £2.50 each on four randomly selected days if they completed the survey on those days.
Login details for the app were created prior to the Wave 14 fieldwork for all sample members who had completed at least one previous interview. New sample members who completed the Wave 14 survey were routed around the invitation to the Wellbeing app study.
The experiments are controlled by several variables. All allocations were done at the household level. All allocations were equal, i.e. ½ for two conditions, 1/3 for three conditions, etc. All treatment allocations were crossed or stratified to ensure that the allocations for each experiment were balanced across the treatments to the other experiments.
The controlling variables are on the record m_hhsamp_ip:
ff_appposw13 (1/2 each)
1 Wellbeing App invitation early in IP13 interview
2 Wellbeing App invitation late in IP13 interview
ff_applengthw13 (1/2 each)
1 2 minute daily app survey
2 10 minute daily app survey
ff_appincentw13 (1/3 each)
1 No additional incentive
2 £10 if all 14 days completed
3 £2.50 each on four randomly selected days if app survey completed on those days
The sample file for the Wellbeing app study includes a final set of randomised allocation variables (ff_rndaw13, ff_rndbw13, ff_rndcw13, ff_rnddw13) that control the random day on which bonuses were given for the group ff_appincentw13=3.
The variables affected by this experiment are in the record m_indresp_ip:
mobtext, appoutc1, appprob1, welldebrief1, welldebriefoth1, casiintnofwc, appoutc2, appprob2, welldebrief2, welldebriefoth2.
