Format

Send to

Choose Destination
Am J Crit Care. 2011 Mar;20(2):146-52. doi: 10.4037/ajcc2010931. Epub 2010 Apr 8.

Measuring depressive symptoms in heart failure: validity and reliability of the patient health questionnaire-8.

Author information

1
University of Michigan School of Nursing, Ann Arbor, 48109, USA. spressle@umich.edu

Abstract

BACKGROUND:

Depressive symptoms are common in patients with heart failure, but few investigators have reported the validity and reliability of measures of depressive symptoms among these patients.

OBJECTIVES:

To evaluate the validity and reliability of a measure of depressive symptoms, the Patient Health Questionnaire-8 (PHQ-8), among 249 patients with chronic heart failure.

METHODS:

As part of a larger study, patients completed the PHQ-8 and the Living With Heart Failure Questionnaire. New York Heart Association class was assessed as a measure of the severity of heart failure. Construct validity of the PHQ-8 was evaluated by confirmatory factor analysis, Pearson correlation coefficients, and analysis of variance. Internal consistency reliability was estimated by using the Cronbach α.

RESULTS:

The sample was 63% men, with a mean age of 63 years, and 67% reported their race as white. Construct validity of the PHQ-8 was supported. The confirmatory factor analysis model reflected the emotional and somatic dimensions of depressive symptoms and displayed a good fit with the data. The χ(2) value of the PHQ-8 was 24.75 with 18 degrees of freedom (P =.13) and the goodness-of-fit index was 0.98. The PHQ-8 was significantly correlated with the total and subscale scores on the Living With Heart Failure Questionnaire (P <.001 for all correlations). Differences in the PHQ-8 scores were found among New York Heart Association classes (F=20.4, P<.001). The PHQ-8 internal consistency reliability (Cronbach α) was 0.82.

CONCLUSIONS:

The PHQ-8 demonstrated satisfactory validity and reliability; these results support its use to measure depressive symptoms in patients with heart failure.

PMID:
20378777
DOI:
10.4037/ajcc2010931
[Indexed for MEDLINE]
Free full text

Supplemental Content

Full text links

Icon for HighWire
Loading ...
Support Center