Calc Function

    • Calcs that help predict probability of a diseaseDiagnosis
    • Subcategory of 'Diagnosis' designed to be very sensitiveRule Out
    • Disease is diagnosed: prognosticate to guide treatmentPrognosis
    • Numerical inputs and outputsFormula
    • Med treatment and moreTreatment
    • Suggested protocolsAlgorithm

    Disease

    Select...

    Specialty

    Select...

    Chief Complaint

    Select...

    Organ System

    Select...

    Patent Pending

    Major Depression Index (MDI)

    Screens for depression based on clinically significant questions.
    Favorite

    INSTRUCTIONS

    Rate based on how the patient has been feeling over the past two weeks.
    When to Use
    Why Use
    • Patients who identify as depressed or who may be suffering from depression.
    • The QIDS can also be trended over time to help providers and patients alike see trends like improvements in depressive symptoms over time.

    The MDI can help objectify and rate the severity of a patient's depression.

    About the Creator
    Dr. Per Bech

    Result:

    Please fill out required fields.

    Next Steps
    Evidence
    Creator Insights

    Advice

    Patients with depression should be provided with further resources and potentially referred to psychiatry, as well as be screened for emergency psychiatric conditions like suicidal ideation or psychosis.

    Formula

    Addition of the selected points as above. For more information, click here.

    Point Values

    • +5= All the time
    • +4= Most of the time
    • +3= Slightly more than half the time
    • +2= Slightly less than half the time
    • +1= Some of the time
    • 0= At no time

    Facts & Figures

    • Symptoms are rated based on how the patient has been feeling over the past two weeks.
    • The diagnostic demarcation line indicates at which point a symptom is severe enough to be used in the DSM-IV diagnostic algorithm of major depression.
    • The first three symptoms (mood, interest and fatigue) should have been present at least “most of the time” during the past two weeks, while other symptoms should have been present during “more than half of the time” during the period for diagnosis of major depression.
    • For symptoms 4 and 5 (guilt), only the highest score should be used, as they pertain to the same diagnostic criteria for depression in DSM-IV.
    • For symptoms 8a and 8b (psychomotor changes), only the highest score should be used, as they pertain to the same diagnostic criteria for depression in DSM-IV.
    • For symptoms 10a and 10b (weight/appetite), only the highest score should be used, as they pertain to the same diagnostic criteria for depression in DSM-IV.
    • Major depression is diagnosed if ≥5 of the 9 symptoms (items 4 and 5 combined) have been present in the past two weeks and if symptom 1 or 2 are included in these 5 symptoms.
    • Per the DSM-IV, the 9 diagnostic criteria for Major Depression are (in the order they appear above):
      • Mood
      • Interest
      • Fatigue
      • Guilt
      • Suicidal ideation
      • Concentration
      • Psychomotor changes
      • Sleep
      • Weight/appetite

    Score interpretation:

    • Scores of 20-24 indicate mild depression.
    • Scores of 25-29 indicate moderate depression.
    • Scores ≥30 indicate severe depression.
    Dr. Per Bech

    About the Creator

    Per Bech, MD, trained in psychiatry at the University of Copenhagen. He is an active lecturer and researcher in psychiatry and psychometrics. He was recently appointed Professor of Applied Psychometrics at the University of Copenhagen. He has won many awards both within Denmark and abroad for his research and prowess within the field.

    To view Dr. Per Bech's publications, visit PubMed