Progression of level of training during the training period. The number of patients training at levels 1, 2, and 3 at training sessions 1, 5, 10, 15 and 20. Note that the number of patients is reduced over time since the patients attended training until surgery, and the time from start of training to surgery was dependent on the waiting list and was not pre-defined in the study. Data for training level is missing for one patient.
Ageberg et al. BMC Musculoskeletal Disorders 2010 11:126 doi:10.1186/1471-2474-11-126