Confronta i metodi

	Questionario sulla Salute del Paziente-9 (PHQ-9)	Impressione Globale del Paziente sul Cambiamento (PGIC)
Campo	Psicologia clinica	Psicologia clinica
Famiglia	Process / pipeline	Process / pipeline
Anno di origine	2001	1976
Ideatore	Kurt Kroenke	William Guy
Tipo	Self-report questionnaire	Self-report single-item rating
Fonte seminale	Kroenke, K., Spitzer, R. L., & Williams, J. B. (2001). The PHQ-9: validity of a brief depression severity measure. Journal of General Internal Medicine, 16(9), 606–613.	Guy, W. (1976). ECDEU Assessment Manual for Psychopharmacology. Rockville, MD: National Institute of Mental Health, US Department of Health, Education, and Welfare.
Alias	PHQ-9, Patient Health Questionnaire Depression Module	PGIC, Patient Global Impression of Change Scale
Correlati	5	4
Sintesi	The PHQ-9 is a brief, nine-item self-report questionnaire developed by Kroenke, Spitzer, and Williams to screen for and measure the severity of depressive symptoms. Published in 2001 in the Journal of General Internal Medicine, it has become one of the most widely used depression screening instruments globally. The scale maps directly to DSM-IV diagnostic criteria for major depressive disorder, making it valuable in both clinical and research settings.	The Patient Global Impression of Change is a single-item, seven-point rating scale asking patients to report their overall impression of change since treatment initiation. Originally published by William Guy in the ECDEU Assessment Manual in 1976, the PGIC has become a standard co-primary endpoint in clinical trials assessing treatment efficacy. The scale is endorsed by the FDA as a patient-reported outcome measure for demonstrating clinical benefit. Despite its simplicity, the PGIC captures patients' holistic perception of improvement—integrating symptom reduction, functional recovery, and subjective well-being.