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[Chinese Polarity Inventory: its adaptation to our setting].

INTRODUCTION
The Chinese Polarity Inventory (CPI) is a self-report scale for bipolar disorder assessment, composed of two scales (mania and depression), with 20 items for each one.


OBJECTIVES
Translate, adapt and validate the CPI to our context.


MATERIAL AND METHODS
The questionnaire was applied to 123 patients: bipolar disorder in the manic phase (32), depressed (17), remission (30) and mixed state (3). We also established a control group with 30 patients without affective disorder. Internal consistency was assessed using Cronbach's alpha. On the other hand, validity was established using the Clinician Administered Rating Scale for Mania (CARS-M) in manic patients and the Hamilton scale in the depressed ones as a gold standard.


RESULTS
This scale has good psychometrics qualities. Internal consistence index (Cronbach's alpha) for the manic scale was 0.90 and for depression scale was 0.92. The correlation coefficient between the manic scale and the CARS-M was 0.82 and between the depression scale and the Hamilton scale was 0.67.


CONCLUSIONS
The CPI is an instrument of rapid and easy application that permits self-report of bipolar disorders. The best benefit for this scale is the possibility of application in the entire course of illness, for clinical and investigation activities and assessment of the treatment response.