FIG. 4.

Meta-analyses of all the laser and LED parameters for 15 reported studies. Box and whisker plot diagrams indicate inner points, outer points, mean markers, mean line, and upper and lower quartile ranges for all reported PBM settings. Wavelengths (618–1064 nm), laser power (0.033–1.7 W), beam area/spot size (0.0028–4.8 cm²), treatment time per point (3–1200 sec), treatment time per visit (60–1200 sec), energy dose per point (0.25–222 J), energy dose per visit (2–222 J), fluence per point (7.07–3750 J/cm²), contact points per visit (1–20), and number of appointments (1–21). LED, light emitting diode; PBM, photobiomodulation.