Key points are not available for this paper at this time.
The evidence presents support for the one-dimensional model and measurement invariance of the PHQ-9 measure, allowing for reliable comparisons between sex, age groups, education level, socioeconomic status, marital status, and residence area, and recommends its use within the Peruvian population.
Villarreal‐Zegarra et al. (Mon,) studied this question.