PHQ-2 (Patient Health Questionnaire-2) - Scientific Formula
Neurology & Psychiatry Equation
Standard Calibration Equation:
Score = Symptom interest (0-3) + Depressed feeling (0-3)
Accuracy Bounds & Limits:
While mathematical calculators evaluate demographic models, extreme variance (hyperthyroidism, dialysis cases, muscular bodybuilders, pregnancy) can trigger output errors. Weight and clearance assessments must follow separate personalized titration grids.