HIGHLIGHTS
SUMMARY
The authors carried out an intensive longitudinal study (also known as ecological momentary assessment) using self-report data collected through a custom smartphone app supplemented by activity data from a wrist worn accelerometer. The methods were tested in a 7-day pilot study in November 2020- December 2020 with 20 participants to check that the data items had good face validity with participants and were answered appropriately. The intensive data collection period of 14 days was preceded by a run-in period of 7 days with twice daily data entry to familiarise participants with . . .
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