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The PHQ-9 model consists of 9 questions which enables the physician to measure the severity of depression and monitor it over the course of treatment.
Instructions:
Over the last 2 weeks, how often have you been bothered by any of the following problems?
Instructions:
Over the last 2 weeks, how often have you been bothered by any of the following problems?
Research authors: Kroenke K, Spitzer RL, Williams JBW
Details
Formula
Study characteristics
Files & References
★★★★
Model author
Model ID
550
Version
1.5
Revision date
2018-08-15
Specialty
MeSH terms
Model type
Linear model
(Calculation)
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Additional information
The patient health questionnaire (PHQ) is a self adminstered version of the PRIME-MD diagnostic instrument for common mental disorders. The PHQ-9 is the depression module, which scores eacht of the 9 S\DSM-IV criteria as "0" (not at all) to "3" (nearly every day). The PHQ-9 was completed by 6000 patients in 8 primary care clinics (3000 patients) and 7 obstetrics gynaecology clinics (3000 patients). Construct validity was assessed using the 20-item short form general health survy, self reported sick days and clinic visits, and symptom related difficulty. Criterion validity was assessed against an independent structured mental health professional (MHP) interviuw in a sample of 580 patients.Study Population
Total population size: 6000Males: {{ model.numberOfMales }}
Females: {{ model.numberOfFemales }}
Continuous characteristics
| Name | Mean | SD | Unit |
|---|---|---|---|
| Age, primary care setting | 46 | 17 | years |
| Age, obstetrics/gynecology group | 31 | 11 | years |
Categorical characteristics
| Name | Subset / Group | Nr. of patients |
|---|---|---|
| Race, primary care setting | White | 2370 |
| African American | 390 | |
| Hispanic | 120 | |
| Marital status, primary care setting | Married | 1440 |
| Never marries | 690 | |
| Divorced/seperated/widowed | 870 | |
| Education, primary care setting | College graduate | 810 |
| Partial college | 810 | |
| High school graduate only | 990 | |
| Less than high school | 390 | |
| Medical conditions, primary care setting | Hypertension | 750 |
| Arthritis | 330 | |
| Diabetes | 240 | |
| Pulmonary | 210 | |
| Race, obstetrics/gynecology group | White | 1170 |
| African American | 450 | |
| Hispanic | 1170 | |
| Marital status, obstetrics/gynecology group | Married | 1560 |
| Never married | 990 | |
| Divorced/separated/widowed | 870 | |
| Education, obstetrics/gynecology group | College graduate | 480 |
| Partial college | 750 | |
| High school graduate only | 960 | |
| Less than high school | 810 | |
| Medical conditions, obstetrics/gynecology group | Hypertension | 60 |
| Arthritis | 30 | |
| Diabetes | 30 | |
| Pulmonary | 60 |
Related files
| Preview | Name | Tags |
|---|---|---|
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706.46 kB | Figure (results-page) Protocol |
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132.56 kB | External validation |
Supporting Publications
| Title or description | Tags |
|---|---|
| The PHQ-9: validity of a brief depression severity measure. | Dataset Internal validation Peer review |
| Validation of PHQ-2 and PHQ-9 to screen for major depression in the primary care population. | External validation |
The PHQ-9 total score contains: ... Points
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Result
Note
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The PHQ-9 total score contains: Points
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Outcome stratification
Result interval
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Conditional information
Result interpretation
PHQ-9 score of ≥10 has a sensitivity of 88% and a specificity of 88% in detecting MDD.
Calculations alone should never dictate patient care, and are no substitute for professional judgement. See our full disclaimer.
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Disclaimer: Calculations alone should never dictate patient care, and are no substitute for professional judgement.
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