The current investigation sought to determine if common covariates (age and level of education) impacted on item responsiveness within the two GHQ-8 sub-scales.
In other words, item responsiveness to pain adds to further item reduction and refinement of a scale.
Subsequent quantitative data collection and analyses will address the psychometric properties of the questionnaire, including the construct validity of some of the single items when compared with existing multi-item scales, item responsiveness, between-item correlations, and other relevant metrics (manuscript in preparation).
After each videotaped interaction (sharing positive and negative events), partners completed a 10-item version of the 18-item Responsiveness Scale (Reis, 2003), as used in Gable et al.
The questionnaire included 21 items in 5 service quality dimensions: tangibles (4 items), reliability (4 items), responsiveness (4 items), assurance (4 items), and empathy (5 items).
There were also four questions about the dimensions of performance as follows: availability (ten items); responsiveness (nine items); productivity (six items) and competence (nine items).
This adaptation of the SERVQUAL survey was made up of twenty-seven paralikertikert scale items measuring five postulated dimensions of service quality, which consist of tangibles (4 items), reliability (7 items), responsiveness (5 items), assurance (5 items), and empathy (6 items).
To compare responsiveness based on item response theory (IRT) with that based on conventional scoring for two patient-reported outcomes measures in carpal tunnel syndrome (CTS); the short disabilities of the arm, shoulder, and hand (QuickDASH) measure, and the 6-item CTS symptoms scale (CTS-6).
The partial least-squares model - which is a compromise between an item response theory or principal components approach and an approach that directly optimizes the sensitivity to changes over time - appears to result in the most robust combinations, and excludes redundant items with lower responsiveness from the composite score.
We provide evidence of unidimensionality, local independence, reliability, Rasch-model fit, absence of differential item functioning, responsiveness, and construct validity.
We term these items "improved" since PROMIS studies document that present tense and a five-item response set improve instrument responsiveness.
