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4,694 items of data are available, covering 4,694 participants, encoded using Data-Coding 93.
The data problem indicator was derived by combining participant reports (e.g. non-wear) with measurements of the size of the uncompressed dataset returned by the accelerometer device. This field is only present for accelerometer datasets that have had a problem recorded against them. A value of zero indicates that a dataset reported as unreliable was subsequently examined and found to be acceptable.