More recently, Kopec and colleagues proposed a web-based computerized adaptive test (CAT-5D-QOL) to measure five domains of health-related quality of life (Daily Activities, Walking, Handling Objects, Pain or Discomfort, and Feelings) for patients with back pain based upon item banks developed for these domains relevant to arthritis [ 35].
Based upon item analysis and exploratory factor analysis, we retained 33 items, and 5 factors explained 51.75% of the total variance: Suicide and Self-Injurious Behaviors (SS), Aggression and Violence (AV), Rule Breaking (RB), Substance Use (SU), and Unprotected Sex (US).
Comparison was based upon item-factor differences, model fit statistics, inter-factor and inter-instrument correlations, and Cronbach's alphas.
However, this is driven by a different theoretical approach to CTT, based upon items not discriminating well or not having much information.
The MDS data are generally internally consistent and several of the multi-item scales based upon MDS items have reasonably good levels of internal consistency and reliability.
The items in CGPQ and CBAQ were earlier viewed as comprising four scales (a bipolar gender scale, a boy typical scale, a girl typical scale, and a cross-gender scale); this view was based upon differential item correlations with the factor-analytically derived scales of a second gender behavior questionnaire (Meyer-Bahlburg et al., 1994a, b).
Since irritability and agitation were based upon YMRS items, they were not independent with regard to YMRS remission.
The character moves around the environment based on the player's choices; however, the areas the character can move into are restricted based upon the items the player has, similar to most platform games.
The cost data were extracted and summed from the hospital billing records, while the ICU cost calculation was based upon line items associated with an ICU departmental code.
The measurement of the insomnia diagnosis was based upon four items, each rated along a five-point scale ("never", "rarely (a few times per year)", "sometimes (a few times per month)", "mostly (several times a week)" or "always").
In view of our limited sample size (and particularly the ratio of students to items) we elected in the first instance to examine in detail the psychometric properties of the musculoskeletal component of the EMQ examination, acknowledging the limitations associated with the accuracy of the person estimate based upon 24 items (29).
