Item-level psychometrics of the Ascertain Dementia Eight-Item Informant Questionnaire.
The aim of this study is to evaluate the item-level psychometrics of the Ascertain Dementia Eight-Item Informant Questionnaire (AD-8) by examining its dimensionality, rating scale integrity, item fit statistics, item difficulty hierarchy, item-person match, and precision. We used confirmatory factor...
| Main Authors: | , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Public Library of Science (PLoS)
2022-01-01
|
| Series: | PLoS ONE |
| Online Access: | https://doi.org/10.1371/journal.pone.0270204 |
| _version_ | 1811287469932412928 |
|---|---|
| author | Yeajin Ham Suyeong Bae Heerim Lee Yaena Ha Heesu Choi Ji-Hyuk Park Hae Yean Park Ickpyo Hong |
| author_facet | Yeajin Ham Suyeong Bae Heerim Lee Yaena Ha Heesu Choi Ji-Hyuk Park Hae Yean Park Ickpyo Hong |
| author_sort | Yeajin Ham |
| collection | DOAJ |
| description | The aim of this study is to evaluate the item-level psychometrics of the Ascertain Dementia Eight-Item Informant Questionnaire (AD-8) by examining its dimensionality, rating scale integrity, item fit statistics, item difficulty hierarchy, item-person match, and precision. We used confirmatory factor analysis and the Rasch rating scale model for analyzing the data extracted from the proxy versions of the 2019 and 2020 National Health and Aging Trends Study, USA. A total of 403 participants were included in the analysis. The confirmatory factor analysis with a 1-factor model using the robust weighted least squares (WLSMV) estimator indicated a unidimensional measurement structure (χ2 = 41.015, df = 20, p = 0.004; root mean square error of approximation = 0.051; comparative fit index = 0.995; Tucker-Lewis Index = 0.993;). The findings indicated that the AD-8 has no misfitting items and no differential item functioning across sex and gender. The items were evenly distributed in the item difficulty rating (range: -2.30 to 0.98 logits). While there were floor effects, the AD-8 revealed good reliability (Rasch person reliability = 0.67, Cronbach's alpha = 0.89). The Rasch analysis reveals that the AD-8 has excellent psychometric properties that can be used as a screening assessment tool in clinical settings allowing clinicians to measure dementia both quickly and efficiently. To summarize, the AD-8 could be a useful primary screening tool to be used with additional diagnostic testing, if the patient is accompanied by a reliable informant. |
| first_indexed | 2024-04-13T03:19:02Z |
| format | Article |
| id | doaj.art-e0a1808180634fbdb58b855d3b98efbb |
| institution | Directory Open Access Journal |
| issn | 1932-6203 |
| language | English |
| last_indexed | 2024-04-13T03:19:02Z |
| publishDate | 2022-01-01 |
| publisher | Public Library of Science (PLoS) |
| record_format | Article |
| series | PLoS ONE |
| spelling | doaj.art-e0a1808180634fbdb58b855d3b98efbb2022-12-22T03:04:50ZengPublic Library of Science (PLoS)PLoS ONE1932-62032022-01-01177e027020410.1371/journal.pone.0270204Item-level psychometrics of the Ascertain Dementia Eight-Item Informant Questionnaire.Yeajin HamSuyeong BaeHeerim LeeYaena HaHeesu ChoiJi-Hyuk ParkHae Yean ParkIckpyo HongThe aim of this study is to evaluate the item-level psychometrics of the Ascertain Dementia Eight-Item Informant Questionnaire (AD-8) by examining its dimensionality, rating scale integrity, item fit statistics, item difficulty hierarchy, item-person match, and precision. We used confirmatory factor analysis and the Rasch rating scale model for analyzing the data extracted from the proxy versions of the 2019 and 2020 National Health and Aging Trends Study, USA. A total of 403 participants were included in the analysis. The confirmatory factor analysis with a 1-factor model using the robust weighted least squares (WLSMV) estimator indicated a unidimensional measurement structure (χ2 = 41.015, df = 20, p = 0.004; root mean square error of approximation = 0.051; comparative fit index = 0.995; Tucker-Lewis Index = 0.993;). The findings indicated that the AD-8 has no misfitting items and no differential item functioning across sex and gender. The items were evenly distributed in the item difficulty rating (range: -2.30 to 0.98 logits). While there were floor effects, the AD-8 revealed good reliability (Rasch person reliability = 0.67, Cronbach's alpha = 0.89). The Rasch analysis reveals that the AD-8 has excellent psychometric properties that can be used as a screening assessment tool in clinical settings allowing clinicians to measure dementia both quickly and efficiently. To summarize, the AD-8 could be a useful primary screening tool to be used with additional diagnostic testing, if the patient is accompanied by a reliable informant.https://doi.org/10.1371/journal.pone.0270204 |
| spellingShingle | Yeajin Ham Suyeong Bae Heerim Lee Yaena Ha Heesu Choi Ji-Hyuk Park Hae Yean Park Ickpyo Hong Item-level psychometrics of the Ascertain Dementia Eight-Item Informant Questionnaire. PLoS ONE |
| title | Item-level psychometrics of the Ascertain Dementia Eight-Item Informant Questionnaire. |
| title_full | Item-level psychometrics of the Ascertain Dementia Eight-Item Informant Questionnaire. |
| title_fullStr | Item-level psychometrics of the Ascertain Dementia Eight-Item Informant Questionnaire. |
| title_full_unstemmed | Item-level psychometrics of the Ascertain Dementia Eight-Item Informant Questionnaire. |
| title_short | Item-level psychometrics of the Ascertain Dementia Eight-Item Informant Questionnaire. |
| title_sort | item level psychometrics of the ascertain dementia eight item informant questionnaire |
| url | https://doi.org/10.1371/journal.pone.0270204 |
| work_keys_str_mv | AT yeajinham itemlevelpsychometricsoftheascertaindementiaeightiteminformantquestionnaire AT suyeongbae itemlevelpsychometricsoftheascertaindementiaeightiteminformantquestionnaire AT heerimlee itemlevelpsychometricsoftheascertaindementiaeightiteminformantquestionnaire AT yaenaha itemlevelpsychometricsoftheascertaindementiaeightiteminformantquestionnaire AT heesuchoi itemlevelpsychometricsoftheascertaindementiaeightiteminformantquestionnaire AT jihyukpark itemlevelpsychometricsoftheascertaindementiaeightiteminformantquestionnaire AT haeyeanpark itemlevelpsychometricsoftheascertaindementiaeightiteminformantquestionnaire AT ickpyohong itemlevelpsychometricsoftheascertaindementiaeightiteminformantquestionnaire |