Effect of low level laser therapy as compared to placebo/no therapy on overall incidence of severe (grade 3 or 4) mucositis stratified by patient, laser and risk of bias characteristics.

Abbreviations: RR – risk ratio; CI – confidence interval; HSCT – hematopoietic stem cell transplantation. ¥All analyses used a random-effect model. A risk ratio <1 with 95% CIs that do not include 1, suggests that low level laser is better than placebo/no therapy. Effect of low level laser therapy as compared to placebo/no therapy on overall incidence of severe (grade 3 or 4) mucositis stratified by patient, laser and risk of bias characteristics.