Objective:

To determine the psychometric properties of the instrument "Assessment of nurse-family interpersonal relationships in the Intensive Care Unit (VRIEF-ICU)."

Materiales and method:

Five-phase instrumental study: i) content validity through expert judgment, ii) construct validity by implementing exploratory factor analysis, iii) criterion validity analyzing correlation with a theoretically compatible instrument, iv) reliability with the reliability index by halves, and v) analysis of difficulty/consistency through the Rasch model. The pilot sample consisted of 430 relatives of adult patients admitted to the ICU of two university hospitals. The sample for the expert judgment was 7 specialists.

Results:

The VRIEF-UCI showed a global concordance index of 0.96; construct validity determined that the instrument is one-dimensional with an explained variance of 68.6% for one factor; criterion validity evidenced a correlation index with the external criterion of 0.876; the reliability of the instrument is determined with a reliability index by halves of 0.90. The Rasch model showed adequate levels of difficulty, which translates into a high probability that participants adequately develop the instrument (mean square residuals of 0.99 and standardized statistical fit of -0.1 for internal fit, and mean square residuals of 1.01 and standardized statistical fit of 0.1 for external fit).

Conclusions:

The psychometric properties of the VRIEF-UCI instrument are suitable for assessing the interpersonal relationships between nurse and family in the intensive care unit.

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