The research version of the SCID is much longer than the Clinician Version because it contains more disorders, subtypes, severity and course specifiers, and provisions for coding the specific details of past mood episodes. It is designed to include most of the information that is diagnostically useful to researchers. It is expected that researchers will customize this version of the SCID to fit their needs, choosing only those parts that are relevant to their particular studies. For this reason, the SCID-I is published in a single-sided page, unbound format. Users of the SCID are also encouraged to modify the instrument to accommodate the requirements of a particular study--for example, by including additional items such as rating scales of severity. This may require updating the GO TO statements as well.
There are three ways in which research investigators typically use the SCID. Most often the SCID is used to select a study population. For example, in a study of the effectiveness of several treatments for depression, the SCID can be used to insure that all of the study subjects have symptoms that meet the DSM-IV criteria for Major Depressive Disorder. The SCID is also used to exclude subjects with certain disorders. For example, in the study mentioned above, the researchers may wish to use the SCID to exclude all patients with a history of any Substance Use Disorder. Finally, the SCID is often used to characterize a study population in terms of current and past psychiatric diagnoses.
Two standard editions of the research version of the SCID are available for diagnosing the major Axis I and II disorders.
The SCID-I/P (Patient Edition) is designed for use with subjects who are identified as psychiatric patients. It contains the following modules:
SCID-I/P Summary Score Sheet
For settings in which psychotic disorders are expected to be rare (e.g., an outpatient anxiety clinic) or for studies in which patients with psychotic disorders are being screened out, an abridged edition of the SCID-I/P (SCID-I/P W/ PSYCHOTIC SCREEN) is available. This edition replaces the B and C modules with a combined B/C module that includes only screening questions about psychotic symptoms, omitting the lengthy psychotic disorders decision tree so that a specific psychotic disorder diagnosis is not made. In addition, the SCID-I/P (W/PSYCHOTIC SCREEN) has an abridged summary score sheet that does not include psychotic disorders.
The SCID-I/NP (Non-patient Edition) is for use in studies in which the subjects are not identified as psychiatric patients (e.g., community surveys, family studies, research in primary care). The diagnostic modules of the SCID-I/NP are the same as those of the SCID-I/P (W/PSYCHOTIC SCREEN); the only difference in the two versions is in the Overview section. In the SCID-I/NP there is no assumption of a chief complaint, and other questions are used to inquire about a history of psychopathology.
The SCID-I/NP contains the following modules:
It is possible to convert a SCID-I/P into a SCID-I/NP by substituting the appropriate Summary Score Sheet, Overview and Psychotic Screening Module.
The table below indicates the symptoms, episodes, and disorders that are included in the SCID modules.