Korean J Fam Med.  2015 Nov;36(6):286-293. 10.4082/kjfm.2015.36.6.286.

Development of the Perceived Stress Inventory: A New Questionnaire for Korean Population Surveys

Affiliations
  • 1Department of Family Medicine, Inje University Ilsan Paik Hospital, Inje University College of Medicine, Goyang, Korea.
  • 2Department of the Family Medicine, Kangbuk Samsung Hospital, SungKyunKwan University School of Medicine, Seoul, Korea. hshinsmc@samsung.co.kr, wideclean@yahoo.co.kr
  • 3Department of Family Medicine, Hallym University Dongtan Sacred Heart Hospital, Hallym University College of Medicine, Hwaseong, Korea.
  • 4Kangnam University Graduate School of Education, Yongin, Korea.

Abstract

BACKGROUND
Given emerging evidence of the association between stress and disease, practitioners need a tool for measuring stress. Several instruments exist to measure perceived stress; however, none of them are applicable for population surveys because stress conceptualization can differ by population. The aim of this study was to develop and validate the Perceived Stress Inventory (PSI) and its short version for use in population surveys and clinical practice in Korea.
METHODS
From a pool of perceived stress items collected from three widely used instruments, 20 items were selected for the new measurement tool. Nine of these items were selected for the short version. We evaluated the validity of the items using exploratory factor analysis of the preliminary data. To evaluate the convergent validity of the PSI, 387 healthy people were recruited and stratified on the basis of age and sex. Confirmatory analyses and examination of structural stability were also carried out. To evaluate discriminatory validity, the PSI score of a group with depressive symptoms was compared with that of a healthy group. A similar comparison was also done for persons with anxious mood.
RESULTS
Exploratory factor analysis supported a three-factor construct (tension, depression, and anger) for the PSI. Reliability values were satisfactory, ranging from 0.67 to 0.87. Convergent validity was confirmed through correlation with the Perceived Stress Scale, Center for Epidemiologic Studies Depression Scale, and State-Trait Anxiety Inventory. People with depressive or anxious mood had higher scores than the healthy group on the total PSI, all three dimensions, and the short version.
CONCLUSION
The long and short versions of the PSI are valid and reliable tools for measuring perceived stress. These instruments offer benefits for stress research using population-based surveys.

Keyword

Stress; Measurement; Factor Analysis, Statistical; Validity; Reliability

MeSH Terms

Anxiety
Depression
Epidemiologic Studies
Factor Analysis, Statistical
Humans
Korea
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