Repeatability of a Rasch model of the AQ20 over five assessments

Elizabeth A Barley; Paul W Jones

doi:10.1007/s11136-005-5466-z

Repeatability of a Rasch model of the AQ20 over five assessments

Elizabeth A Barley, Paul W Jones

Child & Family Health Nursing

Research output: Contribution to journal › Article › peer-review

11 Citations (Scopus)

Abstract

Rasch analysis is now used widely to assess the measurement properties of health status questionnaires. This study tested the stability of the AQ20 - a dichotomous-response measure of health status in asthma, using parameters estimated by a Rasch model. One hundred forty-four asthma patients completed the AQ20 on five occasions over 3 months. At visit 1, two items showed significant misfit and were deleted. At each visit, the overall mean item-person and item-trait interaction statistics from the remaining 18 items (AQ18) were very similar. The repeatability of the item calibrations was excellent (intraclass correlation coefficient 0.95), despite the patients' health having changed (repeated-measures ANOVA: FEV(1) and AQ18 score p

Original language	English
Pages (from-to)	801-9
Number of pages	9
Journal	Quality of Life Research
Volume	15
Issue number	5
DOIs	https://doi.org/10.1007/s11136-005-5466-z
Publication status	Published - May 2006

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abstract = "Rasch analysis is now used widely to assess the measurement properties of health status questionnaires. This study tested the stability of the AQ20 - a dichotomous-response measure of health status in asthma, using parameters estimated by a Rasch model. One hundred forty-four asthma patients completed the AQ20 on five occasions over 3 months. At visit 1, two items showed significant misfit and were deleted. At each visit, the overall mean item-person and item-trait interaction statistics from the remaining 18 items (AQ18) were very similar. The repeatability of the item calibrations was excellent (intraclass correlation coefficient 0.95), despite the patients' health having changed (repeated-measures ANOVA: FEV(1) and AQ18 score p",

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Repeatability of a Rasch model of the AQ20 over five assessments

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