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Reliability and validity of a modified PHQ-9 item inventory (PHQ-12) as a screening instrument for assessing depression in Asian Indians (CURES-65).
J Assoc Physicians India. 2009 Feb; 57:147-52.JA

Abstract

OBJECTIVES

To evaluate the validity and reliability of the modified Patient Health Questionnaire(PHQ) 12 item instrument as a screening tool for assessing depression compared to the PHQ-9 in a representative south Indian urban population.

METHODS

The Chennai Urban Rural Epidemiology Study [CURES] is a large cross-sectional study conducted in Chennai, South India. In Phase 1 of CURES(urban component), 26,001 individuals aged > or =20 years individuals were selected by a systematic sampling technique of whom one hundred subjects were randomly selected, using computer-generated numbers, for this validation study. Two self-reported questionnaires (modified PHQ-12 item and PHQ-9 item) were administered to the subjects to compare their effectiveness in detecting depression. Reliability and validity were assessed and Receiver Operating Characteristic (ROC) curves were plotted. Pearson's correlation was used to compare the two questionnaires.

RESULTS

The mean age of the study was 38.6 +/- 11.6 years and 48% were males. Pearson's correlation coefficient between the modified PHQ-12 and the PHQ-9 item was 0.913 [p < 0.0001]. Factor Analysis revealed that the modified PHQ-12 item scale can be used as a unidimensional scale and had excellent internal consistency (Cronbach's alpha: 0.88). A cut point of >4 calculated using the ROC curves for the modified PHQ-12 item had the highest sensitivity (92.0%) and specificity (90.7%) using PHQ-9 as the gold standard. The positive predictive value was 76.7%, and the negative predictive value, 97.1% and the area under the ROC curve, 0.979 (95% Confidence Interval: 0.929 - 0.997, p < 0.0001).

CONCLUSION

The modified PHQ-12 item is a valid and reliable instrument for large scale population based screening of depression in Asian Indians and a cut point score of greater than 4 gave the highest sensitivity and specificity.

Authors+Show Affiliations

Madras Diabetes Research Foundation & Dr. Mohan's Diabetes Specialities Centre, Gopalapuram, Chennai, India.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Randomized Controlled Trial
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

19582982

Citation

Poongothai, S, et al. "Reliability and Validity of a Modified PHQ-9 Item Inventory (PHQ-12) as a Screening Instrument for Assessing Depression in Asian Indians (CURES-65)." The Journal of the Association of Physicians of India, vol. 57, 2009, pp. 147-52.
Poongothai S, Pradeepa R, Ganesan A, et al. Reliability and validity of a modified PHQ-9 item inventory (PHQ-12) as a screening instrument for assessing depression in Asian Indians (CURES-65). J Assoc Physicians India. 2009;57:147-52.
Poongothai, S., Pradeepa, R., Ganesan, A., & Mohan, V. (2009). Reliability and validity of a modified PHQ-9 item inventory (PHQ-12) as a screening instrument for assessing depression in Asian Indians (CURES-65). The Journal of the Association of Physicians of India, 57, 147-52.
Poongothai S, et al. Reliability and Validity of a Modified PHQ-9 Item Inventory (PHQ-12) as a Screening Instrument for Assessing Depression in Asian Indians (CURES-65). J Assoc Physicians India. 2009;57:147-52. PubMed PMID: 19582982.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Reliability and validity of a modified PHQ-9 item inventory (PHQ-12) as a screening instrument for assessing depression in Asian Indians (CURES-65). AU - Poongothai,S, AU - Pradeepa,R, AU - Ganesan,A, AU - Mohan,V, PY - 2009/7/9/entrez PY - 2009/7/9/pubmed PY - 2009/8/21/medline SP - 147 EP - 52 JF - The Journal of the Association of Physicians of India JO - J Assoc Physicians India VL - 57 N2 - OBJECTIVES: To evaluate the validity and reliability of the modified Patient Health Questionnaire(PHQ) 12 item instrument as a screening tool for assessing depression compared to the PHQ-9 in a representative south Indian urban population. METHODS: The Chennai Urban Rural Epidemiology Study [CURES] is a large cross-sectional study conducted in Chennai, South India. In Phase 1 of CURES(urban component), 26,001 individuals aged > or =20 years individuals were selected by a systematic sampling technique of whom one hundred subjects were randomly selected, using computer-generated numbers, for this validation study. Two self-reported questionnaires (modified PHQ-12 item and PHQ-9 item) were administered to the subjects to compare their effectiveness in detecting depression. Reliability and validity were assessed and Receiver Operating Characteristic (ROC) curves were plotted. Pearson's correlation was used to compare the two questionnaires. RESULTS: The mean age of the study was 38.6 +/- 11.6 years and 48% were males. Pearson's correlation coefficient between the modified PHQ-12 and the PHQ-9 item was 0.913 [p < 0.0001]. Factor Analysis revealed that the modified PHQ-12 item scale can be used as a unidimensional scale and had excellent internal consistency (Cronbach's alpha: 0.88). A cut point of >4 calculated using the ROC curves for the modified PHQ-12 item had the highest sensitivity (92.0%) and specificity (90.7%) using PHQ-9 as the gold standard. The positive predictive value was 76.7%, and the negative predictive value, 97.1% and the area under the ROC curve, 0.979 (95% Confidence Interval: 0.929 - 0.997, p < 0.0001). CONCLUSION: The modified PHQ-12 item is a valid and reliable instrument for large scale population based screening of depression in Asian Indians and a cut point score of greater than 4 gave the highest sensitivity and specificity. SN - 0004-5772 UR - https://www.unboundmedicine.com/medline/citation/19582982/Reliability_and_validity_of_a_modified_PHQ_9_item_inventory__PHQ_12__as_a_screening_instrument_for_assessing_depression_in_Asian_Indians__CURES_65__ L2 - http://www.diseaseinfosearch.org/result/2199 DB - PRIME DP - Unbound Medicine ER -