Case-Control Matching

The case-control matching algorithm matches a predefined set of case patients to patients in a control pool. A single case is matched to one or more controls based on data points in common (age, gender, race, number of healthcare encounters, etc...). Data points are binned and converted to their corresponding bin value prior to matching. The i2b2 user running the application indicates the fields to be binned in the PATIENT_DIMENSION table and the number of intervals (bins) for each field. Numeric fields are binned by quantiles specified by the investigator. Character string fields are ranked by frequency; any value with a rank greater than the user supplied threshold is converted to 0 for "other".

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