Methodological approaches to shortening composite measurement scales

Coste, Joël; Guillemin, Françis; Pouchot, J.; Fermanian, Jacques

doi:10.1016/s0895-4356(96)00363-0

Cited by 203 publications

(228 citation statements)

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“…Coste et al (5) reviewed the approaches to the shortening of composite measurement scales, and showed that the major statistical methods available are a) correlation or regression analysis and b) factor analysis. They pointed out the analytic problems caused by correlated errors in the former approach.…”

Section: Methodsmentioning

confidence: 99%

“…Since items in an HRQoL scale or subscale should be highly correlated, and since some items may be more informative than others from a clinical or statistical point of view, it is reasonable to abbreviate an existing lengthy questionnaire by excluding less-informative items (4,5). The shortening of composite measurement scales is relatively common in the educational and psychological fields in contrast to the health research field.…”

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confidence: 99%

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Quick-FLIC

et al. 2003

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Section: Methodsmentioning

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Quick-FLIC

et al. 2003

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“…It has been practised in the educational, psychological and, to a lesser extend, health research field (Coste et al, 1997). Ware et al (1996) successfully streamlined a generic quality of life measurethe Short Form 36 Health Survey -from 36 items to 12 items.…”

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Quick-FLIC: validation of a short questionnaire for assessing quality of life of cancer patients

Cheung

Wong

et al. 2004

Br J Cancer

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A practically useful measure of quality of life should be simple and quick to complete. A shortened Chinese version of the Functional Living Index -Cancer (FLIC) was recently proposed and was called Quick-FLIC. This study aims to assess the measurement properties of the Quick-FLIC. A total of 190 patients who received care from the National Cancer Centre of Singapore completed a questionnaire package at baseline. Patients filled in a retest questionnaire on average 2 weeks after baseline to assess test -retest reliability and responsiveness to change. The Quick-FLIC scores correlated well with the Functional Assessment of Chronic TherapyGeneral scores (r ¼ 0.78). Patients with different treatment status, performance status and self-rated health had significantly different Quick-FLIC scores in the expected directions (ANOVA; each Po0.001). Internal consistency (Cronbach's alpha ¼ 0.87) and 2-week test -retest reliability (intraclass correlation ¼ 0.81) were also satisfactory. The measure was responsive to changes in health status (Po0.001). The Quick-FLIC is a valid and reliable measure of health-related quality of life of cancer patients. The shortening of established health-related quality of life instruments should be considered in order to reduce the burden of having patients to answer lengthy questionnaires.

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“…The shortening of measures of self-reported outcome has been practised quite widely in educational and psychological research but surprisingly, has not been common in studies of quality of life of cancer patients (Coste et al, 1997). Research in other therapeutic areas has demonstrated the practicability of reducing the number of questions in composite measurement scales by 60 -70% (Ware et al, 1996;Moran et al, 2001).…”

Section: Discussionmentioning

confidence: 99%

Validation of the English and Chinese versions of the Quick-FLIC quality of life questionnaire

Cheung

Thumboo

et al. 2005

Br J Cancer

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A useful measure of quality of life should be easy and quick to complete. Recently, we reported the development and validation of a shortened Chinese version of the Functional Living Index -Cancer (FLIC), which we called the Quick-FLIC. In the present study of 327 English-speaking and 221 Chinese-speaking cancer patients, we validated the English version of the Quick-FLIC and further assessed the Chinese version. The 11 Quick-FLIC items were administered alongside the 11 remaining items of the full FLIC, but there appeared to be little context effect. Validity of the English version of the Quick-FLIC was attested by its strong correlation with two other measures of quality of life, and its ability to detect differences between patients with different performance status and treatment status (each Po0.001). Its internal consistency (alpha ¼ 0.86) and test -retest reliability (intraclass correlation ¼ 0.76) were also satisfactory. The measure was responsive to changes in performance status (Po0.001). The Chinese version showed similar characteristics. The Quick-FLIC behaved in ways that are highly comparable with the FLIC, even though the Quick-FLIC comprised only 11 items whereas the FLIC comprised 22. Further research is required to see whether the use of shorter instruments can improve data quality and response rates, but the fact that shorter instruments place less burden on the patients is itself inherently important.

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Methodological approaches to shortening composite measurement scales

Cited by 203 publications

References 20 publications

Quick-FLIC

Quick-FLIC

Quick-FLIC: validation of a short questionnaire for assessing quality of life of cancer patients

Validation of the English and Chinese versions of the Quick-FLIC quality of life questionnaire

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