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The Longitudinal Interval Follow-up Evaluation:  A Comprehensive Method for Assessing Outcome in Prospective Longitudinal Studies

Martin B. Keller, MD; Philip W. Lavori, PhD; Barbara Friedman, MA; Eileen Nielsen, MA; Jean Endicott, PhD; Pat McDonald-Scott, MA; Nancy C. Andreasen, MD
Arch Gen Psychiatry. 1987;44(6):540-548. doi:10.1001/archpsyc.1987.01800180050009.
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• The Longitudinal Interval Follow-up Evaluation (LIFE) is an integrated system for assessing the longitudinal course of psychiatric disorders. It consists of a semistructured interview, an instruction booklet, a coding sheet, and a set of training materials. An interviewer uses the LIFE to collect detailed psychosocial, psychopathologic, and treatment information for a six-month follow-up interval. The weekly psychopathology measures ("psychiatric status ratings") are ordinal symptom-based scales with categories defined to match the levels of symptoms used in the Research Diagnostic Criteria. The ratings provide a separate, concurrent record of the course of each disorder initially diagnosed in patients or developing during the follow-up. Any DSM-III or Research Diagnostic Criteria disorder can be rated with the LIFE, and any length or number of follow-up intervals can be accommodated. The psychosocial and treatment information is recorded so that these data can be linked temporally to the psychiatric status ratings.

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