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52,164 items of data are available, covering 47,390 participants. Some values have special meanings defined by Data-Coding 1317. Defined-instances run from 2 to 3, labelled using Instancing 2. Units of measurement are Units.
The exact location of the head and the radio-frequency receive coil in the scanner can affect data quality and imaging-derived phenotypes. To help account for variations in position in different scanned participants, several variables have been generated which describe aspects of the positioning and can be used as "confounding variables" - for example they might be regressed out of brain phenotypes before carrying out correlations between these and non-imaging variables.
The transverse brain position is the Y-co-ordinate (front-back relative to head) of the back of the brain mask within the scanner.