Iranian Journal of Psychiatry 2017. 12(3):182-187.

Evaluation of Bipolar Disorder in Several Recurrences over the Time Using Generalized Estimating Equations
Payam Amini, Roya Najafi-Vosough, Ali Ghaleiha, hossein mahjub

Abstract


Objective: Bipolar disorder is characterized by periods of manic, depression, or mixed episodes. The purpose of this study was to assess the development of bipolar disorder episode over the time as well as determining the risk factors affecting bipolar disorder.

Methods: This retrospective cohort study was conducted in Hamadan Province, the west of Iran, from April 2008 to September 2014 including 124 patients with bipolar disorder. All patients had experienced four recurrences. Generalized Estimating Equation (GEE) as a longitudinal modeling approach was used due to longitudinally recording of bipolar disorders. A significant level of 0.05 was considered for the tests.

Results: The mean (SD) age of the 124 patients was 33.2 (11.55). GEE showed that the odds of manic males than depressed or mixed (as well as manic or depressed than mixed female patients according to proportionality of odds) is 1.99 times than those of females. The odds ratio of mania than depression or mixed (as well as mania or depression than mixed) is 0.441 for patients who used both drugs and psychotherapy comparing to only drugs. As well, the odds ratios comparing spring to winter and autumn are 2.01 and 1.82, respectively

Conclusion: The results from this study using GEE method showed that in an Iranian bipolar disorder patients, mania is much more prevalent than depression or mixed as well as mania and depression than mixed. Sex, treatments and the seasons of recurrence can determine the episode of bipolar disorder.

Keywords


Bipolar Disorder; Generalized Estimating Equation model; Iran

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