The Brunnsviken Brief Quality of Life Scale (BBQ): Development and Psychometric Evaluation

Philip Lindner, Ola Frykheden, David Forsström, Erik Andersson, Brjánn Ljótsson, Erik Hedman, Gerhard Andersson, Per Carlbring, Philip Lindner, Ola Frykheden, David Forsström, Erik Andersson, Brjánn Ljótsson, Erik Hedman, Gerhard Andersson, Per Carlbring

Abstract

Measurements of subjective quality of life (QoL) are an important complement to symptom ratings in clinical research and practice. Despite there being several established QoL self-rating scales, we identified a need for a freely accessible, easy-to-use inventory, validated for use with both clinical and non-clinical samples, based on the overall life satisfaction conceptualization of QoL. The Brunnsviken Brief Quality of life scale (BBQ) was designed to meet these requirements. Items were selected by performing a factor analysis on a large data-set of QoL ratings collected previously. Six life areas (Leisure time, View on life, Creativity, Learning, Friends and Friendship, and View of self) were identified as important for overall QoL and were included in the BBQ. A psychometric evaluation was performed using two independent samples: healthy undergraduate students (n = 163), and a sample seeking treatment for social anxiety disorder (n = 568). Results suggested a unifactorial structure, with good concurrent and convergent validity, high internal and test-retest reliability, and accurate classification ability. We conclude that the BBQ is a valid and reliable measure of subjective QoL for use in clinical and research settings. The BBQ is presently available in 31 languages and can be freely downloaded from www.bbqscale.com .

Keywords: Psychometrics; life satisfaction; quality of life; self-rating scale.

Figures

Figure 1.
Figure 1.
Parallel analysis scree plot.
Figure 2.
Figure 2.
Regression results (A) Full sample scatter plot (SAD group in blue, undergraduate in red) along with OLS (in red) and quantile (in black, dashed) regression lines. (B) Intercept plot for quantiles (white line; CIs in dark gray). Red line: OLS intercept (with CI). (C) Parameter (slope) plot for quantiles (white lines; CI in dark gray). Red line: OLS regression slope (with CI).
Figure 3.
Figure 3.
BBQ inter-item correlation matrix Pearson correlation coefficients (with 95% CIs) calculated using the full sample (n = 731). All correlations significant (p < .001).
Figure 4.
Figure 4.
BBQ test-retest Bland–Altman plot Red solid line shows mean test-retest score difference (dotted lines are 95% bootstrapped confidence intervals).
Figure 5.
Figure 5.
Classification accuracy of the BBQ and QOLI in identifying cases of SAD.

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Source: PubMed

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