Testing the interval-level measurement property of multi-item visual analogue scales

Paul F M Krabbe; Peep F M Stalmeier; Leida M Lamers; Jan J V Busschbach

doi:10.1007/s11136-006-0027-7

Testing the interval-level measurement property of multi-item visual analogue scales

Paul F M Krabbe
, Peep F M Stalmeier
, Leida M Lamers
, Jan J V Busschbach

Research output: Contribution to journal › Article › Academic › peer-review

27 Citations (Scopus)

Abstract

BACKGROUND: Conditions were studied that may invalidate health-state values derived from the visual analogue scale (VAS).

METHODS: Respondents were asked to place cards with descriptions of EQ-5D health states on a 20 cm EuroQol VAS and modified versions of it, positioning them such that the distances between the states reflect their valuation for these states. Anchor-point bias was examined using the standard EuroQol VAS (n = 212) and a modified version (n = 97) with a different lower anchor. Context bias was examined in another group of respondents (n = 112) who valued three different sets of EQ-5D health states. Marker bias was studied in yet another group of respondents (n = 100) who placed the same EQ-5D states on the standard EuroQol VAS and on a modified VAS without anchors, categories, or measurement markers.

RESULTS: No indication for the existence of the anchor-point and the marker bias was found. However, the VAS valuations were significantly affected by the context of the set of health states in the scaling task.

CONCLUSION: Advanced methodologies should be incorporated in VAS valuation studies to deal with the context bias.

Original language	English
Pages (from-to)	1651-1661
Number of pages	11
Journal	Quality of Life Research
Volume	15
Issue number	10
DOIs	https://doi.org/10.1007/s11136-006-0027-7
Publication status	Published - Dec-2006

Keywords

Adolescent
Adult
Aged
Female
Health Status
Health Status Indicators
Humans
Male
Middle Aged
Pain Measurement

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title = "Testing the interval-level measurement property of multi-item visual analogue scales",

abstract = "BACKGROUND: Conditions were studied that may invalidate health-state values derived from the visual analogue scale (VAS).METHODS: Respondents were asked to place cards with descriptions of EQ-5D health states on a 20 cm EuroQol VAS and modified versions of it, positioning them such that the distances between the states reflect their valuation for these states. Anchor-point bias was examined using the standard EuroQol VAS (n = 212) and a modified version (n = 97) with a different lower anchor. Context bias was examined in another group of respondents (n = 112) who valued three different sets of EQ-5D health states. Marker bias was studied in yet another group of respondents (n = 100) who placed the same EQ-5D states on the standard EuroQol VAS and on a modified VAS without anchors, categories, or measurement markers.RESULTS: No indication for the existence of the anchor-point and the marker bias was found. However, the VAS valuations were significantly affected by the context of the set of health states in the scaling task.CONCLUSION: Advanced methodologies should be incorporated in VAS valuation studies to deal with the context bias.",

keywords = "Adolescent, Adult, Aged, Female, Health Status, Health Status Indicators, Humans, Male, Middle Aged, Pain Measurement",

author = "Krabbe, \{Paul F M\} and Stalmeier, \{Peep F M\} and Lamers, \{Leida M\} and Busschbach, \{Jan J V\}",

year = "2006",

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doi = "10.1007/s11136-006-0027-7",

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AU - Krabbe, Paul F M

AU - Stalmeier, Peep F M

AU - Lamers, Leida M

AU - Busschbach, Jan J V

PY - 2006/12

Y1 - 2006/12

N2 - BACKGROUND: Conditions were studied that may invalidate health-state values derived from the visual analogue scale (VAS).METHODS: Respondents were asked to place cards with descriptions of EQ-5D health states on a 20 cm EuroQol VAS and modified versions of it, positioning them such that the distances between the states reflect their valuation for these states. Anchor-point bias was examined using the standard EuroQol VAS (n = 212) and a modified version (n = 97) with a different lower anchor. Context bias was examined in another group of respondents (n = 112) who valued three different sets of EQ-5D health states. Marker bias was studied in yet another group of respondents (n = 100) who placed the same EQ-5D states on the standard EuroQol VAS and on a modified VAS without anchors, categories, or measurement markers.RESULTS: No indication for the existence of the anchor-point and the marker bias was found. However, the VAS valuations were significantly affected by the context of the set of health states in the scaling task.CONCLUSION: Advanced methodologies should be incorporated in VAS valuation studies to deal with the context bias.

AB - BACKGROUND: Conditions were studied that may invalidate health-state values derived from the visual analogue scale (VAS).METHODS: Respondents were asked to place cards with descriptions of EQ-5D health states on a 20 cm EuroQol VAS and modified versions of it, positioning them such that the distances between the states reflect their valuation for these states. Anchor-point bias was examined using the standard EuroQol VAS (n = 212) and a modified version (n = 97) with a different lower anchor. Context bias was examined in another group of respondents (n = 112) who valued three different sets of EQ-5D health states. Marker bias was studied in yet another group of respondents (n = 100) who placed the same EQ-5D states on the standard EuroQol VAS and on a modified VAS without anchors, categories, or measurement markers.RESULTS: No indication for the existence of the anchor-point and the marker bias was found. However, the VAS valuations were significantly affected by the context of the set of health states in the scaling task.CONCLUSION: Advanced methodologies should be incorporated in VAS valuation studies to deal with the context bias.

KW - Adolescent

KW - Adult

KW - Aged

KW - Female

KW - Health Status

KW - Health Status Indicators

KW - Humans

KW - Male

KW - Middle Aged

KW - Pain Measurement

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DO - 10.1007/s11136-006-0027-7

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SN - 0962-9343

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EP - 1661

JO - Quality of Life Research

JF - Quality of Life Research

IS - 10

ER -

Testing the interval-level measurement property of multi-item visual analogue scales

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Keywords

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