Introduction:

The aim of this research was to confirm the internal structure of the Environmental Reward Observation Scale (EROS) and to collect evidence of its relationship with other constructs in a Colombian sample of 902 adults who voluntarily consented to participate.

Method:

Psychometric analyses were performed using Classical Test Theory and the Rasch model. Evidence of validity based on internal structure and relations of scores with other variables was collected.

Results:

Good indexes were obtained in McDonald’s Alpha and Omega coefficients, 9 of the 10 items had good adjustments in the Infit and Outfit indexes, and item 8 presented DIF in the educational level. The unidimensional structure of the EROS was confirmed and was invariant with respect to sex and educational level. Scores had high magnitude correlations with emotional symptomatology and variables related to Behavioral Activation.

Conclusions:

The EROS presented high psychometric qualities for its use in the Colombian population; however, its use is recommended only for screening assessment because the levels of information are centered in a reduced area along the Logit scaling.

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