Zung Self-Rating Depression Scale

Background

Zung’s model for depression, the Zung Self-Rating Depression scale, measures psychological and somatic symptoms linked to depression.  In addition, the scale can be used as a screening tool, monitor for changes, and clinical research purposes.
   
The questionnaire includes 20-items testing four common characteristic of depression – the pervasive effect, the physiological equivalents, other disturbances, and psychomotor activities. Respondents are given a 4-point scale to react to positive or negative statements. Approximately 10 minutes is required to complete the test.

Author
: Dr. William W.K. Zung


Structure

  1. Twenty question survey completed by patient
  2. Likert Scale Format
  3. Asks half of questions positively and half negatively
    1. Negative Example: "I notice that I am losing weight"
    2. Positive Example: "I eat as much as I used to"
  4. Answers scored on 1 to 4 scale
    1. Minimal: None or a little of the time
    2. Severe: Most or all of the time



Questions and Scoring

Please read each statement and decide how much of the time the statement describes how you’ve been feeling during the past 2 weeks. Respond to all statements.
  1. I fell down-hearted and blue.
    • A little of the time (1)
    • Some of the time (2)
    • Good part of the time (3)
    • Most of the time (4)
  1. Morning is when I feel the best.
    • A little of the time (4)
    • Some of the time (3)
    • Good part of the time (2)
    • Most of the time (1)
  1. I have crying spells or feel like it.
    • A little of the time (1)
    • Some of the time (2)
    • Good part of the time (3)
    • Most of the time (4)
  1. I have trouble sleeping at night.
    • A little of the time (1)
    • Some of the time (2)
    • Good part of the time (3)
    • Most of the time (4)
  1. I eat as much as I used to.
    • A little of the time (4)
    • Some of the time (3)
    • Good part of the time (2)
    • Most of the time (1)
  1. I still enjoy sex.
    • A little of the time (4)
    • Some of the time (3)
    • Good part of the time (2)
    • Most of the time (1)
  1. I notice that I am losing weight.
    • A little of the time (1)
    • Some of the time (2)
    • Good part of the time (3)
    • Most of the time (4)
  1. I have trouble with constipation.
    • A little of the time (1)
    • Some of the time (2)
    • Good part of the time (3)
    • Most of the time (4)
  1. My heart beats faster than usual.
    • A little of the time (1)
    • Some of the time (2)
    • Good part of the time (3)
    • Most of the time (4)
  1. I get tired for no reason.
    • A little of the time (1)
    • Some of the time (2)
    • Good part of the time (3)
    • Most of the time (4)
  1. My mind is as clear as it used to be.
    • A little of the time (4)
    • Some of the time (3)
    • Good part of the time (2)
    • Most of the time (1)
  1. I find it easy to do the things I used to.
    • A little of the time (4)
    • Some of the time (3)
    • Good part of the time (2)
    • Most of the time (1)
  1. I am restless and can't keep still.
    • A little of the time (1)
    • Some of the time (2)
    • Good part of the time (3)
    • Most of the time (4)
  1. I feel hopeful about the future.
    • A little of the time (4)
    • Some of the time (3)
    • Good part of the time (2)
    • Most of the time (1)
  1. I am more irritable than usual.
    • A little of the time (1)
    • Some of the time (2)
    • Good part of the time (3)
    • Most of the time (4)
  1. I find it easy to make decisions.
    • A little of the time (4)
    • Some of the time (3)
    • Good part of the time (2)
    • Most of the time (1)
  1. I feel that I am useful and needed.
    • A little of the time (4)
    • Some of the time (3)
    • Good part of the time (2)
    • Most of the time (1)
  1. My life is pretty full.
    • A little of the time (4)
    • Some of the time (3)
    • Good part of the time (2)
    • Most of the time (1)
  1. I feel that others would be better off if I were dead.
    • A little of the time (1)
    • Some of the time (2)
    • Good part of the time (3)
    • Most of the time (4)
  1. I still enjoy the things I used to do.
    • A little of the time (4)
    • Some of the time (3)
    • Good part of the time (2)
    • Most of the time (1)
Scores Interpretation

Scores on the test range from 25 through 100. The scores fall into four ranges:
  • Score <50: Normal
  • Score <60: Mild depression
  • Score <70: Moderate or Marked Major Depression
  • Score >70: Severe or Extreme Major Depression






Sources and Additional Information:

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