103,659 bulk items are available, covering 103,659 participants.
The values held within this field are coded links to files held within a bulk repository, not the actual data itself.
These time-series files describe a participant's accelerometer measured physical activity intensity every five seconds. Each measurement represents the average vector magnitude across all samples recorded in each five second epoch/period. This file may be useful for those interested in analysing accelerometer measured physical activity by time.
The first column contains the acceleration value where the units of measurement are milli-gravity. The second column indicates whether this is an actual measurement (value = <blank>) or imputed (value = 1). The time associated with each reading can be inferred from the very first row, which describes the start and end times of the data. Each successive reading is incremented by five seconds.
"acceleration (mg) - 2014-05-07 13:29:50 - 2014-05-13 09:50:25 - sampleRate = 5 seconds, imputed"
indicates that the first measurement time is at 2014-05-07 13:29:50, the second at 2014-05-07 13:29:55, the third at 2014-05-07 13:30:00 ... and the last at 2014-05-13 09:50:25.
Files are typically 760KB each in the raw state and usually compress to around 170KB.