Normative data and psychometric properties of the Patient Health Questionnaire-9 in a nationally representative Korean population

Cheolmin Shin, Young Hoon Ko, Hyonggin An, Ho Kyoung Yoon, Changsu Han

    Research output: Contribution to journalArticlepeer-review

    6 Citations (Scopus)

    Abstract

    Background: The Patient Health Questionnaire-9 (PHQ-9) has been standardized in several populations and is widely used in clinical practice and health care. However, it has not been appropriately standardized in the Korean general population, and no normative data have been presented. The aim of this study was to provide the normative data and psychometric properties of the PHQ-9 in the nationally representative population of Korea. Methods: We used the nationwide cross-sectional survey data of Korea from 2014 to 2016. The data of 10,759 individuals aged over 19 years were analyzed in this study. As the distribution of the PHQ-9 scores was not normative, the percentile ranks for raw scores were provided. The survey questionnaires included the PHQ-9, The EuroQol-5 Dimension (EQ-5D), and demographic characteristics. We analyzed the construct validity and internal consistency of the PHQ-9. Results: The normative data of the PHQ-9 were generated according to the sex and different age categories. The correlation coefficient between the sum of the PHQ-9 scores and the EQ-5D index was 0.44, which was moderate. The most appropriate model was the two-factor model with five 'affective-somatic' labeled items and four 'cognitive' labeled items. Cronbach's α for the PHQ-9 was 0.79. Conclusions: Our result supports reliability and validity with two-factor structure of PHQ-9 for measuring depression in the Korean nationally representative population. The Korean normative data on the PHQ-9 according to percentile rank can assist in interpreting and comparing scores with other populations.

    Original languageEnglish
    Article number194
    JournalBMC Psychiatry
    Volume20
    Issue number1
    DOIs
    Publication statusPublished - 2020 Apr 30

    Keywords

    • Depression
    • Nationally representative population
    • Normative data
    • PHQ-9
    • Standardization

    ASJC Scopus subject areas

    • Psychiatry and Mental health

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