Item reduction based on rigorous methodological guidelines is necessary to maintain validity when shortening composite measurement scales

Goetz, Christophe; Coste, Joël; Lemétayer, Fabienne; Rat, Anne‐Christine; Montel, Sébastien; Recchia, Sophie; Debouverie, M.; Pouchot, J.; Spitz, Élisabeth; Guillemin, Françis

doi:10.1016/j.jclinepi.2012.12.015

Cited by 124 publications

(158 citation statements)

References 15 publications

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“…We note also that the emotional domain of SIS is problematic, a feature worthy of further exploration. Previous work on modifying existing assessment tools have tended to restrict analyses to a single data set 25. We created independent data sets for derivation and validation.…”

Section: Discussionmentioning

confidence: 99%

Derivation and Validation of a Modified Short Form of the Stroke Impact Scale

MacIsaac

Ali

Peters

et al. 2016

JAHA

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BackgroundThe Stroke Impact Scale (SIS) is a stroke‐specific, quality of life measure recommended for research and clinical practice. Completion rates are suboptimal and could relate to test burden. We derived and validated a short form SIS (SF‐SIS).Methods and ResultsWe examined data from the Virtual International Stroke Trial Archive, generating derivation and validation populations. We derived an SF‐SIS by selecting 1 item per domain of SIS, choosing items most highly correlated with total domain score. Our validation described agreement of SF‐SIS with original SIS and the SIS‐16 and correlation with Barthel Index, modified Rankin Scale, National Institutes of Health Stroke Scale, and Euro‐QoL 5 dimensions visual analog scales. We assessed discriminative validity (associations between SF‐SIS and factors known to influence outcome [age, physiological parameters, and comorbidity]). We assessed face validity and acceptability by sharing the SF‐SIS with a focus group of stroke survivors and multidisciplinary stroke healthcare staff. From 5549 acute study patients (mean age 68.5 [SD 13] years, mean SIS 64 [SD 32]) and 332 rehabilitation patients (mean age 65.7 [SD 11] years, mean SIS 61 [SD 11]), we derived an 8‐item SF‐SIS that demonstrated good agreement with original SIS and good correlation with our chosen functional and quality of life measures (all ρ>0.70, P<0.0001). Significant associations were seen with our chosen predictors of stroke outcome in the acute group (P<0.0001). The focus group agreed with the choice of items for SF‐SIS across 7 of 8 domains. ConclusionsUsing multiple, complementary methods, we have derived an SF‐SIS and demonstrated content, convergent, and discriminant validity. This shortened SIS should allow collection of robust quality of life data with less associated test burden.

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Section: Discussionmentioning

confidence: 99%

Derivation and Validation of a Modified Short Form of the Stroke Impact Scale

MacIsaac

Ali

Peters

et al. 2016

JAHA

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“…Despite the absence of consensus regarding the most appropriate procedures for the creation of shorter versions, recommendations exist (17)(18)(19) and the application of clinimetric and psychometric procedures is suggested (18)(19)(20) . A previous study using two different methodologies for the creation of a Short Version of the QASCI was carried out …”

Section: Discussionmentioning

confidence: 99%

“…Of the set of criteria adopted for the reduction of items, the one which weighed the most on the choice was the factor load. In developing a review of the literature on methods used in 91 studies for creating reduced measures, the authors (19) highlight that factor analysis is a popular technique, having been used in over half of the analyzed studies.…”

Section: Descriptoresmentioning

confidence: 99%

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Development of the short version of the informal caregiver burden assessment questionnaire

Martins

Cardoso

Araújo

et al. 2015

Rev. esc. enferm. USP

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Objetive: to create a reduced version of the QASCI, which is structurally equivalent to the long one and meets the criteria of reliability and validity. Method: Through secondary data from previous studies, the participants were divided into two samples, one for the development of reduced version and the second for study of the factorial validity. Participants responded to QASCI, the SF 36, the ADHS and demographic questions. Results: A reduced version of 14 items showed adequate psychometric properties of validity and internal consistency, adapted to a heptadimensional structure that assesses positive and negative aspects of care. Conclusion: Confirmatory factor analysis revealed a good fit with the advocated theoretical model.

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“…As expected, there were substantial differences in item response characteristics obtained in the RA and LT populations, so we next followed an iterative process for shortening measurement scales recommended by Goetz and colleagues. 20 During this process, we chose items to ensure we met four goals: (1) adequately represent all three conceptual subdomains (obligatory, committed and discretionary), (2) preserve the spectrum of activity difficulty and hierarchy of activities, (3) achieve scoring and scale performance characteristics in the LT-VLA that correspond closely to the original VLA measure and (4) validate important psychometric properties of the LT-VLA in a LT population.…”

Section: Valued Life Activities Disability Scalementioning

confidence: 99%