4.1 Assessment of floor and ceiling scores of scales
Lower percentages of floor and ceiling scores and high reliability criteria indicate that the measurement was performed well28,29. A percentage greater than 20% indicates a significant floor / ceiling effect22,30. Considering the effects of floor and ceiling scores of both scales, SSQOL ceiling score percentages were higher in our study, but floor score rates were higher in three subdimensions of SF-36 other than PF / PA. These findings may be due to the fact that though similar, these subdimensions do not evaluate the same structure, and that SF-36 evaluates both the positive and negative aspects of health. However, SSQOL assesses these post-stroke functions in more detail12. In the Turkish version of SSQOL, the PA subdimension assesses upper extremity functions, work / productivity, mobility, and physical status during self-care27. SF-36, on the other hand, evaluates the constraints in severe physical activities due to health problems in the PF subdimension. However, the fact that there were significant positive relationships in the four dimensions of the two scales and that their internal consistencies were close to each other, showed that both scales generally evaluated a similar structural characteristics.