P19
Predictive validity for a non-return to work of the Modified Spinal Function Sort (M-SFS)
D. Riese1, J. Kool1, M. Trippolini2, B. Jansen3, M. Schindl4, P. Oesch1 (1Valens ; 2Bern ; 3Bellikon ; 4Klosterneuburg AT)
Einleitung
According to the Global Burden of Disease Study, musculoskeletal disorders (MSD) are a major cause of incapacity for work. Long-term disability in patients with MSD is often associated with low perceived self-efficacy (PSE). In addition, lower PSE is associated with poorer health outcomes and return to work (RTW). The Modified Spinal Function Sort (M-SFS) is a patient reported health measure to evaluate work-related PSE. The M-SFS contains 20 drawings of physical activities with simple written descriptions. Each task is rated on a 5-point Likert scale ranging from "able" (4 points), to "restricted" (3, 2 or 1 points) or "unable" (0 points) adding up to a total score from 0 to 80. Previous research supports reliable and validity of the M-SFS. However, the predictive validity of the M-SFS for RTW is unknown and is evaluated in this study.
Methodik
Multi-centre prospective cohort study in patients with MSD with PSE assessment at baseline and evaluation of work activity at three months follow-up. Inclusion criteria were non-specific MSD > 3 months, no co-morbidity limiting work ability and informed consent. PSE was evaluated with the M-SFS with a total of 0-80 points and higher scores representing higher PSE. RTW was dichotomized depending on the number of work days (0 or 1-90). We investigated the predictive validity of the M-SFS to predict RTW by receiver operating characteristic (ROC) curve analysis. An Area Under the Curve (AUC) was considered acceptable if >0.7 and excellent if >0.8. We determined the cut-off value for the optimal prediction of RTW and non-RTW and determined specificity and sensitivity.
Resultate
Preliminary results concern 105/164 participants. The mean M-SFS score was 62.7 (SD 13.6). RTW rate was 58%. M-SFS prediction of RTW was excellent, the AUC was 0.828 (95%CI 0.749 – 0.907). M-SFS values <57 predict non-RTW with a sensitivity of 80.3%, and a specificity of 84.1%.
Schlussfolgerungen
The M-SFS for the evaluation of perceived self-efficacy for work-related tasks has excellent predictive validity for RTW. Scores <57 predict non-RTW with >80% sensitivity and specificity.