The outcome questionnaire (OQ-45) has been one of the most frequently used instrument to measure clinical outcomes in psychotherapy. Probably due to its subscale structure, its applicability for a variety of disorders and life struggles, its sensitivity to change by repeated measurements and its predictive ability. Given its popularity, OQ-45 has been translated into several languages.

As the Spanish version has not been published, through this poster it is going to show the reliability and the dimensional structure of the OQ-45.

One hundred and thirty-nine patients in clinical settings have completed the Spanish version. Three different confirmatory factor analysis have been calculated to analyze the construct validity.

The Cronbach Alpha of the instrument was adequate .92, but also, in the three dimensions: symptoms distress (.90), interpersonal relations (.78) and social role (.66). Through the CFA was proved that the Four-factor bi-level model structure [χ2(900) = 3930.47, P < .001, AGF = .86, CFI = .91, RMSEA = .061(.049 to .073)]suited appropriately, in fact, more properly than the three-factor correlated or the three-factor with a second order factor models.

The three-factor bi-level model structure of the OQ-45 is confirmed indicating an empirically and clinically relevant measure of client functioning. In this model each item loaded on one of the three subscales originally created. Besides, each item also captures common variance represented by the general factor of overall maladjustment, where this factor may indicate the degree to which respondents are functionally impaired. Thus, OQ-45 is an instrument that could be used for monitoring treatment efficacy and for making informed decisions about clinically significant changes.

The authors have not supplied their declaration of competing interest.