What is an instance index?

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An instance index is used to distinguish data for a data-field that was collected at different times. For many fields this follows instancing coding 2, where i0 indicates the initial baseline assessment, i1 is an assessment in 2012-13, i2 is an Imaging assessment and i3 is a repeat imaging assessment. For other fields, such as accelerometer data or questionnaire data, the instancing does not relate to an assessment, but rather to repeats of similar measurements. Where a field has more than one instance, the data tab will specify what instancing coding is being used.

For more information, see section 2.5 of the Data Access Guide


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