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Gepubliceerd in: Quality of Life Research 10/2016

01-10-2016

The meaning of vaguely quantified frequency response options on a quality of life scale depends on respondents’ medical status and age

Auteurs: Stefan Schneider, Arthur A. Stone

Gepubliceerd in: Quality of Life Research | Uitgave 10/2016

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Abstract

Purpose

Self-report items in quality of life (QoL) scales commonly use vague quantifiers like “sometimes” or “often” to measure the frequency of health-related experiences. This study examined whether the meaning of such vaguely quantified response options differs depending on people’s medical status and age, which may undermine the validity of QoL group comparisons.

Methods

Respondents (n = 600) rated the frequency of positive and negative QoL experiences using vague quantifiers (never, rarely, sometimes, often, always) and provided open-ended numeric frequency counts for the same items. Negative binomial regression analyses examined whether the numeric frequencies associated with each vague quantifier differed between medical status (no vs. one or more medical conditions) and age (18–40 vs. 60+ years) groups.

Results

Compared to respondents without a chronic condition, those with a medical condition assigned a higher numeric frequency to the same vague quantifiers for negative QoL experiences; this effect was not evident for positive QoL experiences. Older respondents’ numeric frequencies were more extreme (i.e., lower at the low end and somewhat higher at the high end of the response range) than those of younger respondents. After adjusting for these effects, differences in QoL became somewhat more pronounced between medical status groups, but not between age groups.

Conclusions

The results suggest that people with different medical backgrounds and age do not interpret vague frequency quantifiers on a QoL scale in the same way. Open-ended numeric frequency reports may be useful to detect and potentially correct for differences in the meaning of vague quantifiers.
Voetnoten
1
PROMIS wave 1 testing included 24 health conditions; the 16 most prevalent were used here.
 
2
The model could also have been specified using the vague quantifiers as categorical dependent variable and the numeric frequencies as continuous predictor variable. The selected model had the advantage that we could use the vague quantifier categories as dummy-coded predictors, thereby not imposing any assumptions about the functional form (linear, quadratic, etc.) of the relationship between numeric frequencies and vague quantifier categories.
 
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Metagegevens
Titel
The meaning of vaguely quantified frequency response options on a quality of life scale depends on respondents’ medical status and age
Auteurs
Stefan Schneider
Arthur A. Stone
Publicatiedatum
01-10-2016
Uitgeverij
Springer International Publishing
Gepubliceerd in
Quality of Life Research / Uitgave 10/2016
Print ISSN: 0962-9343
Elektronisch ISSN: 1573-2649
DOI
https://doi.org/10.1007/s11136-016-1293-7

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