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The General Behavior Inventory (GBI) is a 73-question psychological self-report assessment tool designed by Richard Depue and colleagues to identify the presence and severity of manic and depressive moods in adults, as well as to assess for cyclothymia. It is one of the most widely used psychometric tests for measuring the severity of bipolar disorder and the fluctuation of symptoms over time. The GBI is intended to be administered for adult populations; however, it has been adapted into versions that allow for juvenile populations (for parents to rate their offspring), as well as a short version that allows for it to be used as a screening test.

Parent GBI (P-GBI)
The P-GBI is an adaptation of the GBI, consisting of 73 Likert scale items rated on a scale from 0 ("Never or Hardly Ever") to 3 ("Very often or Almost Constantly"). It consists of two scales: a depressive symptoms (46 items) and a hypomanic/biphasic (mixed) symptoms (28 items).

Parent GBI-10-Item Mania Scale (PGBI-10M)
The PGBI-10M is a brief (10-item) version of the PGBI that was validated for clinical use for patients presenting with a variety of different diagnoses, including frequent comorbid conditions. It is administered to parents for them to rate their children between ages 5–17. The 10 items include symptoms such as elated mood, high energy, irritability and rapid changes in mood and energy as indicators of potential juvenile bipolar disorder. The PhenX Toolkit uses this instrument as its child protocol for Hypomania/Mania Symptoms.

7 Up 7 Down Inventory (7U7D)
The 7U7D is a 14-item measure of manic and depressive tendencies that was carved from the full length GBI. This version is designed to be applicable for both youths and adults, and to improve separation between both mania and depressive conditions. It was developed via factor analysis from nine separate samples pooled into two age groups, ensuring applicability for use in youth and adults.

Psychometric properties


The GBI has been used extensively in research, including clinical samples, college students, longitudinal, treatment, and other studies. However, no normative data exist to calibrate scores in the general population.

Reliability
The GBI has exceptionally high internal consistency because it has long scales with a large number of items. The GBI shows high reliability whether completed as a self report or as a caregiver report about youth behavior.

Retest reliability also is good over a week or two week period, although the GBI's length makes it tedious to complete frequently.

GBI Scoring
The current GBI questionnaire includes 73 Likert-type items which reflect symptoms of different moods. The original version of the GBI used case scoring where items were given values ranging from 1-4. Symptoms that were rated as 1 or 2 were considered to be absent and symptoms rated as 3 or 4 were considered to be present. However, if each item were to receive one of four scores, the authors of the GBI decided Likert scaling would be a better scoring option. The items on the GBI are now scaled from 0-3 rated as 0 (never or hardly ever present), 1 (sometimes present), 2 (often present), and 3 (very often or almost constantly present).

PGBI-10M
For the PGBI-10M, the scores from each question are added together to form a total score, with higher scores indicating a greater severity of symptoms. Scores range from 0 to 30. Low scores of 5 and below indicate a very low risk of a bipolar diagnosis. High scores of 18 and over indicate a high risk of a diagnosis of bipolar disorder, increasing the likelihood by a factor of seven or greater. Several peer-reviewed research studies support the P-GBI as a reliable and valid measure of bipolar in children and adolescents. It is recommended to be used as part of an assessment battery in the diagnosis of juvenile bipolar disorder.

Limitations
The GBI is free for use clinically and in research. The reading level and length make it challenging for some people to complete. Being a self-report questionnaire, the GBI is not known to have any adverse effects on patients beyond the potential of causing minor distress.

Mechanism
The GBI takes about 10 to 30 minutes to complete, and it has a 12th grade reading level.

Research
Shorter versions of the GBI have been validated for research and clinical use. For instance, the PGBI-10M is currently being tested as part of a large longitudinal study investigating the course of early symptoms of mania in children, with preliminary studies indicating its clinical efficacy in differentiating juvenile bipolar disorder from youth with other diagnoses.

GBI form

 * General Behavior Inventory

For youth

 * EffectiveChildTherapy.Org page on bipolar disorder symptoms

For adults

 * Bipolar disorder symptoms and treatment