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Problems with the sickness impact profile: a theoretically based analysis and a proposal for a new method of
1University of St Andrews, School of Psychology, Fife, Scotland, UK. bsp@st-andrews.ac.uk
Social Science & Medicine (1982)
|March 10, 2001
Summary
The Sickness Impact Profile (SIP) scoring method is flawed. A new scoring approach, using maximum individual item weighting, aligns with the SIP
Area of Science:
- Health outcomes measurement
- Psychometrics
- Medical informatics
Background:
- The Sickness Impact Profile (SIP) is a widely used health status measure.
- Current scoring methods for the SIP are based on limited evidence and lead to inconsistencies.
- Existing scoring is incompatible with the SIP's theoretical framework (Thurstone scaling) and item properties.
Purpose of the Study:
- To identify problems with the current SIP scoring method.
- To propose a new scoring method for the SIP that is theoretically sound and empirically valid.
- To explore a revised implementation of the SIP using the proposed scoring method.
Main Methods:
- Analysis of the SIP's underlying scaling methodology and item characteristics.
- Development of a new scoring method based on maximum individual item weighting.
- Evaluation of the proposed scoring method's impact on SIP scores and implementation.
Main Results:
- The current summated scoring method for the SIP is incompatible with its theoretical basis.
- A proposed scoring method using maximum individual item weighting resolves inconsistencies.
- The new scoring method allows for a reduced item set, particularly for severely limited respondents.
Conclusions:
- A theoretical approach to scoring is crucial for health status measures like the SIP.
- The proposed maximum weighting scoring method offers a valid alternative to current SIP scoring.
- Further empirical investigation is warranted to validate the new SIP scoring and implementation.
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