| Description: | Acceleration intensity time-series |
| Category: | Additional exposures ⏵ Physical activity measurement |
| Acceleromoter data |
| Participants | 103,617 | Value Type | Text | Sexed | Both sexes | Debut | Mar 2016 | |||
| Item count | 103,617 | Item Type | Bulk | Instances | Singular | Version | Apr 2016 | |||
| Stability | Complete | Strata | Derived | Array | No | Cost Tier | 1 |
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The values held within this field are coded links to files held within a bulk repository, not the actual data itself.
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.
For example,
"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.
| Field ID | Description | Relationship |
|---|---|---|
| 90001 | Acceleration data - cwa format | Current Field is derived from Field 90001 |
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