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Psychometric properties of a new treatment expectation scale in rheumatoid arthritis: an application of item response theory.

Ibrahim F, Ayis S, Hofmann D, Rose D, Wykes T, Cope A, Scott DL, Lempp H - BMC Musculoskelet Disord (2015)

Bottom Line: Most items operated in the high expectations part of the items characteristics curves (ICC).Item discrimination varied widely, items with the highest discrimination capacity from the three domains were: pain (physical domain); control of my RA (self-management) and maintaining social role (psycho-social domain); feeling better overall and involvement in treatment decision making (impact of new treatment domain).RA patients' expectations of treatment are higher in the physical and psycho-social domains and less so in the impact of new treatment domain.

View Article: PubMed Central - PubMed

Affiliation: Academic Department of Rheumatology, Faculty of Life Sciences and Medicine, King's College London, London, UK. fowzia.ibrahim@kcl.ac.uk.

ABSTRACT

Background: Patient-generated health outcome measures are important in the assessment of long-term treatment goals for Rheumatoid Arthritis (RA), but few psychometrically sound measures are available. The MAPLe-RA (Measuring Actual Patient-Led expectations in RA) is a new questionnaire and its psychometric properties are not investigated. This study aims to examine these properties for each of the items using Item Response Theory (IRT) .

Methods: Participants were included if they completed the scale (MAPLe-RA). A one parameter (Rasch) model and a two parameter logistic (2PL) model were applied to these data using M-plus software.

Results: One hundred thirty-eight patients with RA were included in the analysis. MAPLe-RA scale comprised of 21 items, the mean score was 71 (20.28) ranging from 0 to 105. Most items operated in the high expectations part of the items characteristics curves (ICC). Item discrimination varied widely, items with the highest discrimination capacity from the three domains were: pain (physical domain); control of my RA (self-management) and maintaining social role (psycho-social domain); feeling better overall and involvement in treatment decision making (impact of new treatment domain).

Conclusion: RA patients' expectations of treatment are higher in the physical and psycho-social domains and less so in the impact of new treatment domain.

No MeSH data available.


Related in: MedlinePlus

Two Parameter Logistic Model (2PLM) item characteristics ccurves (ICC), for two items from each domain of the MAPLe-RA scale
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Fig1: Two Parameter Logistic Model (2PLM) item characteristics ccurves (ICC), for two items from each domain of the MAPLe-RA scale

Mentions: Figure 1 shows the Item Characteristic Curves (ICC) that represents the respondents’ expectations (underlying construct) in relation to the probability of endorsing an item and is presented graphically for two items with the highest discrimination from each domain.Fig. 1


Psychometric properties of a new treatment expectation scale in rheumatoid arthritis: an application of item response theory.

Ibrahim F, Ayis S, Hofmann D, Rose D, Wykes T, Cope A, Scott DL, Lempp H - BMC Musculoskelet Disord (2015)

Two Parameter Logistic Model (2PLM) item characteristics ccurves (ICC), for two items from each domain of the MAPLe-RA scale
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

License 1 - License 2
Show All Figures
getmorefigures.php?uid=PMC4559926&req=5

Fig1: Two Parameter Logistic Model (2PLM) item characteristics ccurves (ICC), for two items from each domain of the MAPLe-RA scale
Mentions: Figure 1 shows the Item Characteristic Curves (ICC) that represents the respondents’ expectations (underlying construct) in relation to the probability of endorsing an item and is presented graphically for two items with the highest discrimination from each domain.Fig. 1

Bottom Line: Most items operated in the high expectations part of the items characteristics curves (ICC).Item discrimination varied widely, items with the highest discrimination capacity from the three domains were: pain (physical domain); control of my RA (self-management) and maintaining social role (psycho-social domain); feeling better overall and involvement in treatment decision making (impact of new treatment domain).RA patients' expectations of treatment are higher in the physical and psycho-social domains and less so in the impact of new treatment domain.

View Article: PubMed Central - PubMed

Affiliation: Academic Department of Rheumatology, Faculty of Life Sciences and Medicine, King's College London, London, UK. fowzia.ibrahim@kcl.ac.uk.

ABSTRACT

Background: Patient-generated health outcome measures are important in the assessment of long-term treatment goals for Rheumatoid Arthritis (RA), but few psychometrically sound measures are available. The MAPLe-RA (Measuring Actual Patient-Led expectations in RA) is a new questionnaire and its psychometric properties are not investigated. This study aims to examine these properties for each of the items using Item Response Theory (IRT) .

Methods: Participants were included if they completed the scale (MAPLe-RA). A one parameter (Rasch) model and a two parameter logistic (2PL) model were applied to these data using M-plus software.

Results: One hundred thirty-eight patients with RA were included in the analysis. MAPLe-RA scale comprised of 21 items, the mean score was 71 (20.28) ranging from 0 to 105. Most items operated in the high expectations part of the items characteristics curves (ICC). Item discrimination varied widely, items with the highest discrimination capacity from the three domains were: pain (physical domain); control of my RA (self-management) and maintaining social role (psycho-social domain); feeling better overall and involvement in treatment decision making (impact of new treatment domain).

Conclusion: RA patients' expectations of treatment are higher in the physical and psycho-social domains and less so in the impact of new treatment domain.

No MeSH data available.


Related in: MedlinePlus