Figure 6From: Short-term efficacy of physical interventions in osteoarthritic knee pain. A systematic review and meta-analysis of randomised placebo-controlled trials Effect size plot LLLT trials. Effect/size plot for LLLT trials. Open circles indicate trials with non-optimal treatment, and black circles indicate trials with optimal dose and treatment procedure. Effect over placebo is related to the x-axis and sample size is related to the y-axis.Back to article page