Abstract
Background The study assessed the psychometric properties of the Life Back on Track (LBoT) measure, a new self-reported single-item global measure of the trajectory of wellbeing after a transport accident. Methods The data come from four waves of the Transport Accident Commission Longitudinal Study (n=1,556 in wave 1), and two repeated cross-sectional surveys– a Client Outcome Survey (n=5,238) and a Client Experience Survey (n=1,964) of individuals injured in a transport accident in Victoria. The conceptual basis of the measure was confirmed in a qualitative analysis of open-ended survey responses. The psychometric performance of the measure, including known-groups validity, test-retest reliability, sensitivity, and responsiveness was investigated. Results The LBoT measure was found to have a conceptual basis of recovery towards a normal life with domains of independence, control, happiness, work, social life, pain, physical function, cognitive function, work and leisure activities, income, anxiety, and depression. There were significant differences in the distribution of the LBoT scores based on the respondent’s depression, pain, return to work status, financial ability to get by, ability to cope, and ability to bounce back. The LBoT measure was a reasonable predictor of future work status and was moderately responsive to change. Conclusions LBoT is a valid measure to track the individual’s trajectory of subjective wellbeing in the context of recovery after a trauma, and it covers wider concepts than health-related quality of life. For use as a performance or tracking measure, however, further evidence is needed on its responsiveness.