Reliability and validity of Persian version of perceived stress scale (PSS-10) in adults with asthma.
BACKGROUND
Asthma is a major public health problem in the world, and recent findings suggest that stress influences asthma and asthma morbidity. The 10-item Perceived Stress Scale (PSS-10) is one of the most frequently used instruments to measure psychological stress. This study was conducted to evaluate the psychometric properties of the Persian versions of the PSS-10 in adults with asthma.


METHODS
In this descriptive cross-sectional study as a methodological research, 106 asthmatic patients referring to several clinics in Sanandaj (western Iran) were selected through convenience sampling. The PSS-10 and the 21-item Depression anxiety and stress scale (DASS-21) were administrated to all patients. Cronbach's alpha was used to evaluate reliability of PSS-10, and confirmatory factor analysis (CFA) and convergent validity were used to evaluate its validity.


RESULTS
The results of confirmatory factor analysis indicated that a two-factor structure of PSS-10 provided a good fit to data. The Cronbach's alpha coefficients for negative factor, positive factor and total score (PSS-10) were 0.86, 0.83, and 0.90, respectively. The PSS-10 was positively correlated with the DASS-21 and its subscales, indicating an acceptable convergent validity. Female asthmatic patients scored higher on PSS-10 in comparison with male asthmatic patients.


CONCLUSIONS
The Persian version of PSS-10 is a valid and reliable instrument to measure perceived stress in adults with asthma.
Department of Epidemiology and Reproductive Health at Reproductive Epidemiology Research Center, Royan Institute for Reproductive Biomedicine, ACECR, Tehran, Iran. a.zareian@ajaums.ac.ir.
Saman
S
Maroufizadeh
Department of Community and Public Health Nursing, Faculty of Nursing, AJA University of Medical Sciences, Tehran, Iran.
Armin
A
Zareiyan
Department of Internal Medicine, School of Medicine, Kurdistan University of Medical Sciences, Sanandaj, Iran.
Naseh
N
Sigari
D000293:Adolescent; D000328:Adult; D000368:Aged; D001249:Asthma / Q000523:psychology*; D003430:Cross-Sectional Studies; D005163:Factor Analysis, Statistical; D005260:Female; D006801:Humans; D007492:Iran / Q000453:epidemiology; D008297:Male; D008875:Middle Aged; D011569:Psychiatric Status Rating Scales; D015203:Reproducibility of Results; D013315:Stress, Psychological / Q000175:diagnosis*; D055815:Young Adult