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Data which in connection with other information can be used to identify an individual with high probability, e.g., age at baseline, race, gender, events, specific findings, etc. NOTE: two levels of indirect identifier are distinguished. Level 1 - not likely to change over time, is visible, and is available in other sources. Typically it is demographic data such as sex, age at a particular date, country, body mass index (BMI). Level 2 - longitudinal information that is likely to change such as measurements, events, age. See also quasi identifier. [PhUSE De-identification Standard for SDTM 3.2, version 1.0.1.]
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