Author/Authors :
Farshad, Mazda Department of Orthopedics - Balgrist University Hospital - University of Zurich - Zurich, Switzerland , Jentzsch, Thorsten Department of Orthopedics - Balgrist University Hospital - University of Zurich - Zurich, Switzerland , Dora, Claudio Swiss Orthopaedics - Bourg-en-Lavaux, Switzerland , M ̈uller, Urs Onaxis Ltd - Bern, Switzerland
Abstract :
e Swiss Orthopaedics Minimal Dataset (SOMD) was launched seven years ago. It is a standardized, generic, andpatient-reported outcome questionnaire, comprising ten items (location of disease, pain within the past four weeks, limitations atwork/leisure/sleep/autonomy, subjective value of a body part, employment status, work disability (sick leave/pension), andhousehold support). We conducted this study about the SOMD to report its reliability, validity, and clinical applicability.Methods.A retrospective observational cohort study was conducted. e test-retest study population (n�60; lost to follow-up:n�7 (12%))was drawn from three retirement homes (in 2013), while the test study population (n�14,180; excluded (e.g., duplicates):n�1,990 (14%)) consisted of patients from a university hospital (in 2014–2017). In the test-retest study population, the samequestionnaire was completed twice (at days 0 and 7). In the test study population, only the first questionnaire was included (toavoid duplicates). In a subgroup of the test study population (n�302), only those patients who completed the SOMD and WesternOntario and McMaster Universities Osteoarthritis Index (WOMAC) of the hip within 14 days were considered (to minimize recallbias). Reliability (test-retest and internal consistency), criterion validity for the item of pain, and return rates were analyzed.Results. e test-retest study population (n�53) showed very high test-retest reliability for all tested items of the SOMD (intraclasscorrelation coefficient�0.96–1.00 (95% confidence interval 0.93–1.00),p<0.001). e test study population (n�12,190) revealedgood internal consistency reliability for all ten items (Cronbach’s alpha�0.80). e return rates of the SOMD were improvable(43% in 2016 and 31% in 2017). e subgroup of the test study population (n�302) displayed a borderline acceptable criterionvalidity (correlation of the item of pain between SOMD and WOMAC hip: rho�0.62,p<0.001).Conclusion. is is the firstreport about the validation of the SOMD. A relatively high reliability (test-retest and internal consistency), borderline acceptable(criterion) validity for the item of pain, and improvable clinical implementation were observed. is analysis serves as the basis fora structured modification of the SOMD to improve its value
