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Type: Thesis
Title: Psychometric properties of the Perceived Stress Scale (PSS), Social Support Scale (SSS) and Sense of Personal Control Scale (SPCS) in Aboriginal Australian populations
Author: Ribeiro Santiago, Pedro Henrique
Issue Date: 2020
School/Discipline: School of Dentistry
Abstract: Background: The history of colonization contributed to Aboriginal and Torres Strait Islanders becoming one of the most disadvantaged groups in Australia. The experienced inequalities in virtually all areas, including employment, income and educational attainment, generate chronic stress, low sense of personal control and lack of social support in the Aboriginal population. Despite these psychosocial variables (perceived stress, sense of personal control and social support) being suggested as important to Aboriginal health, the only measurement instruments available were originally developed in Western countries, with no instruments validated specifically for Aboriginal Australians. The aim of this PhD project was to evaluate the validity and reliability of the Perceived Stress Scale (PSS-14), Social Support Scale (SSS) and Sense of Personal Control Scale (SPCS) in an Aboriginal population. Methods: The main sample was composed of 367 pregnant Aboriginal women who participated in the Baby Teeth Talk Study, an oral-health randomized controlled trial (RCT) conducted in South Australia. Secondary samples comprised: (1) 317 Aboriginal participants from the Teeth Talk Study, an RCT designed to improve oral-health literacy; and (2) 3,857 non-Aboriginal Australians in the population-based cross-sectional study Australia’s National Survey of Adult Oral Health 2004-2006. The psychometric properties of the three scales were analyzed with the Rasch model and Graphical Log-linear Rasch models. The properties evaluated were: (a) dimensionality, (b) model fit, (c) item fit, (d) local dependence, (e) differential item functioning (DIF), (f) reliability, (g) targeting and (h) criterion validity. Conclusions: The findings indicated initial evidence of validity from a revised PSS, after the exclusion of one misfitting item, and a revised SPCS, after the exclusion of five misfitting items. In the case of the SPCS, the development of new culturally specific items is recommended. There was robust evidence that the original 4-item version of the SSS is valid for Aboriginal Australians considering that the good psychometric properties were replicated in two independent samples. The overall conclusion was that, while certain instruments required more modifications than others (e.g. SPCS compared to the SSS), adapted versions of the 3 instruments are available for future research with Aboriginal Australians.
Advisor: Jamieson, Lisa
Smithers, Lisa
Roberts, Rachel
Dissertation Note: Thesis (Ph.D.) -- University of Adelaide, Adelaide Dental School, 2020
Keywords: Aboriginal Australians
Validation studies
Item-response theory
Rasch analysis
Differential item functioning
Provenance: This electronic version is made publicly available by the University of Adelaide in accordance with its open access policy for student theses. Copyright in this thesis remains with the author. This thesis may incorporate third party material which has been used by the author pursuant to Fair Dealing exceptions. If you are the owner of any included third party copyright material you wish to be removed from this electronic version, please complete the take down form located at:
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