Psychometric evaluation of the Persian version of the Type 2 Diabetes and Health Promotion
Scale (T2DHPS): a diabetes-specific measure of lifestyle
Engelsk titel: Psychometric evaluation of the Persian version of the Type 2 Diabetes and Health Promotion
Scale (T2DHPS): a diabetes-specific measure of lifestyle
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Författare:
Saffari, Mohsen
;
Karimi, Tooba
;
Koenig, Harold G
;
Al-Zaben, Faten
Email: m.saffari@bmsu.ac.ir
Språk: Eng
Antal referenser: 37
Dokumenttyp:
Artikel
UI-nummer: 15093454
Sammanfattning
Background: A healthy lifestyle is important for maintaining health and preventing complications in
patients with type 2 diabetes, and yet, few instruments are available to measure this.
Aim: The aim of the present study was to examine the psychometrics of a recently developed tool
that can be used to screen for a health-promoting lifestyle in patients with type 2 diabetes.
Methods: Data were collected from outpatients attending diabetes clinics. The Type 2 Diabetes and
Health Promotion Scale (T2DHPS), EQ-5D, medical records and a demographic questionnaire were
administered to 368 participants. Forward-backward translation of the original English version was
used to develop a Persian version. Internal consistency of the scale was assessed by Cronbach's
alpha and item-to-total correlation. Acceptability was measured by assessing floor and ceiling effects
for each item and subscale. The item scaling test was used to examine the convergent and
discriminant validity of the measure. Pearson correlation was used to determine the predictive
validity of the scale. An explanatory factor analysis and known-group method were used to establish
construct validity.
Results: Adjusted item-total correlations were higher than 0.20. Cronbach's alpha for the 28-item
scale was 0.88 and for subscales ranged from 0.53 to 0.94. Correlations between the total score and
subscale scores were significant (<0.01) and adequate (r's = 0.53). There were significant
relationships between the T2DHPS and both the EQ-5D and indicators of glycaemic control.
Convergent and discriminant validity of the scale was established. Significant differences in lifestyle
dimensions were present between different groups of patients, demonstrating known-group validity. A
six-factor solution was obtained that explained 54.6% of the total variance.
Conclusion: The T2DHPS is a valid and reliable tool for investigating lifestyle behaviours in patients
with type 2 diabetes. Further studies to establish the psychometric properties of the scale in other
languages and cultures are suggested.