6. Equivalence of the IPQ-R: Empirical results
Kocaman et al. (2007) and Armay et al. (2007) translated the IPQ-R into Turkish and validated it by means of principal component analysis (see Section 2.3.3 for details). The structure of the Turkish version of the questionnaire has never been formally examined using a hypothesis-testing framework, which is the appropriate approach for a factor structure that is known a priori. Also, established baseline models are a prerequisite to examining the measurement equivalence of questionnaires across different populations along the proposed framework of questionnaire equivalence. Therefore, the construct and discriminant validity of the Turkish IPQ-R in Turks residing in Turkey and Turkish migrants residing in Germany have been examined as part of the present investigation (Research components 2a/b). The baseline model for Turks residing in Turkey has been published previously (Brzoska et al. 2012b) and will be presented in Section 6.1. Section 6.2 will illustrate the findings with respect to the equivalence of the IPQ-R (Research components 3a-d). The results will be presented along the methodical approach outlined in Chapter 5.
6.1 Establishment of the IPQ-R baseline models
6.1.1 Baseline model in Turks residing in Turkey
In Turkey, 302 patients with diabetes and/or cardiovascular disease participated in the survey. Of these, 183 (60.6%) were female. On average, patients were 53.9 years old (range=18-85 years), with a mean duration of illness treatment of 8.8 years. Males had a significantly different educational status than females, with 8.5% of males as...
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