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Valid group comparisons can be made with the Patient Health Questionnaire (PHQ-9): A measurement invariance study across groups by demographic characteristics
Villarreal-Zegarra D,
Copez-Lonzoy A,
Bernabé-Ortiz A,
Melendez-Torres GJ,
Bazo-Alvarez JC
(2019)
Valid group comparisons can be made with the Patient Health Questionnaire (PHQ-9): A measurement invariance study across groups by demographic characteristics.
PLOS ONE 14(9): e0221717.
https://doi.org/10.1371/journal.pone.0221717