AQoL-6D Adolescent information
As part of the Obesity Prevention in Communities (OPIC), AQoL-6D was adapted for use by adolescents in four countries and recalibrated according to their TTO scores. Details of the project are given in Moodie et al (2009).
Figure 1 below summarises the process of adaptation. In each of the four countries (Australia, New Zealand, Fiji, Tonga) focus groups were conducted with adolescents to determine semantic and cultural equivalents to the language used in AQoL-6D (Step 1). The recalibration of the scoring formula was based upon the stage 2 methodology used in AQoL-6D. Thirty scenarios were constructed from the AQoL-6D descriptive system (step 2) and administered to students in their classrooms (Steps 3, 4). Resulting TTO scores were used in an econometric analysis (Steps 5, 6). TTO results were statistically ‘explained’ to determine the final scoring formula.
In Australia 68 students completed 677 trade-off questions; in Fiji 70 students did 698 questions; in Tonga 81 students did 809 questions; and in New Zealand 60 students did 600 questions.
Figure 1 : AQoL-6D Adolescent Score adaptation process
Use and Scoring of the AQoL-6D Adolescent Instrument
The Australian adolescent scores were related to the general AQoL-6D score with the following equation where 1.19 is the country correction for Australia:
AQoL-6D Adolescent = (AQoL-6D )1.19
Table 1: Correction factors for different countries.
AQoL-6D is the utility score obtained from the scoring formula for the general population on the AQoL website.
The relationship is illustrated in Table 1 below. Figure 1 plots the adjusted (adolescent) score against the adult population score using the 1087 observations obtained from the general population in different AQoL projects.
Table 2: AQoL-6D (Adult) Population and AQoL-6D Adolescent Score for Australia.
|AQoL6D Adult Population Score||AQoL-6D Adolescent Score =|
(AQoL-6D Adult Population Score)1.19
Figure 2 : AQoL-6D Adolescent Score vs AQoL-6D (Adult) Population Score (n=1087)