Abstract
The factorial structure of the Prospective and Retrospective Memory Questionnaire (PRMQ) was investigated in a sample of 336 older adults (aged 66–81 years). Confirmatory factor analyses showed that a bifactor model of two correlated factors of prospective and retrospective memory problems and two uncorrelated group factors of positively and negatively worded items had the best fit. Such a model can be seen as a multitrait-multi-method model that separates the substantive and methodological components among the items of the PRMQ. Correlations of the four factors with external criteria (affect, neuroticism, prospective, and retrospective memory performance) revealed that the item wording factors mainly correlate with the affect variables, whereas the prospective and retrospective memory problem factors were differentially associated with memory performance. As a conceptual conclusion, these differential correlations give support to the discriminant validity of subjective prospective versus retrospective memory problems.
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Notes
The original items can be retrieved from the PRMQ website at http://www.psy.ed.ac.uk/research/hcn/PRMQclick/document_view.
For reasons of comparison, Model 1 was re-estimated while treating the PRMQ items as interval-scaled. Fit indices were lower (CFI = 0.773, SRMR = 0.106), as was the average standardized factor loading (.43). One reason for this may be that most items exhibited considerable skewness, which in case of only a few answer categories makes the ordered-categorical approach more suitable (cf. Muthén and Kaplan 1985).
Model 4 was also re-estimated treating the PRMQ items as interval-scaled. Again, although findings were virtually the same, fit indices were lower (CFI = 0.935, SRMR = 0.069). Once more, this shows that treating the PRMQ items as ordered-categorical not only is statistically more suitable but also comes with the benefit of a better model fit.
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Acknowledgments
The Zurich Longitudinal Study on Cognitive Aging (ZULU) is supported by the Swiss National Science Foundation, grants SNSF-100013-103525 and SNSF-100014-122613/1.
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Communicated by H. W. Wahl.
Appendix
Appendix
Wordings of the positively worded items used in the study
Item no. | Wording |
---|---|
1 | If I decide to do something in a few minutes’ time, I seldom forget to do it |
2 | I hardly fail to recognise a place I have visited before |
10 | If I intend to take something with me, before leaving a room or going out, I rarely leave it behind |
11 | I rarely mislay something that I have just put down, like a magazine or glasses |
12 | I seldom fail to mention or give something to a visitor that I was asked to pass on |
13 | I seldom look at something without realising that I have seen it moments before |
14 | If I tried to contact a friend or relative who was out, I hardly forget to try again later |
15 | I rarely forget what I watched on television the previous day |
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Zimprich, D., Kliegel, M. & Rast, P. The factorial structure and external validity of the prospective and retrospective memory questionnaire in older adults. Eur J Ageing 8, 39–48 (2011). https://doi.org/10.1007/s10433-011-0174-8
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DOI: https://doi.org/10.1007/s10433-011-0174-8