Characteristics of the participants
degenerative knee osteoarthritis
A total of 48 participants with degenerative knee osteoarthritis were enrolled in the intervention (16 participants in each group). One case from the 660 nm group withdrew from the study due to pandemic outbreak in local area. Therefore, a total of 47 participants were pooled into the statistical analysis. All of the outcome measures were compared at the baseline and the results showed no statistically significant differences between the three groups. The characteristics of the participants are presented in Table Characteristics of the participants in each group.