12-Item Short-Form Health Survey
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Item Synonyms Variable Definition Within the psychometric field an item usually reflects a question, and it is a unit of measurement. Items are capable of assuming any of a set of values.
Item Reduction Definition A process during questionnaire development in which items (questions) are identified for possible elimination due to weak psychometric properties. This involves expert opinion; endorsement frequencies; factor analysis and tests of scaling assumptions. The initial list of questions generated is reviewed by a number of healthcare workers experienced in treating and managing the disease. Endorsement frequencies are refers to the proportion of respondents who endorse each response category. Methods such as factor analysis and tests of scaling assumptions (multi trait scaling analysis) are used for checking whether each of the chosen items really does belong to the scale it has been assigned to, and whether each item performs satisfactorily.
12-Item Short-Form Health Survey Definition The SF-12 is one of the most commonly used health-related quality of life questionnaires. It has become widely used in community-based health surveys and outcome assessment of physical and mental illnesses because of its brevity and psychometric performance.
Item-Internal Consistency Definition Item-Internal Consistency coefficients are correlation coefficients between scores for each item and its hypothesized domain. IIC is often used in evaluation on the construction validity of QOL instruments.
ITNs ▶ Insecticide-Treated Nets
IVF ▶ In Vitro Fertilization
IYLL Item Response Theory Definition A form of psychometric theory used for testing the properties of an instrument. Unlike traditional methods that focus upon measures such as averages, IRT places emphasis upon probabilities of responses, which are dependent on the patient’s level of ability to respond to the items on an instrument.
▶ Individual Years of Life Lost
Kappa Definition Kappa statistics are used to measure chancecorrected agreement which are the most widely accepted measure when considering data arising from ordinal scales. Kappa
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