Table 12: Outcomes of RCTs comparing tongue repositioning devices to placebo devices for the treatment of OSA.

Study	Type of study	Respiratory Disturbance Index (h)			ESS
		TRD	Placebo	Mean Difference	TRD	Placebo	Mean Difference
Dort et al. 2008 (32)	Crossover study	8.9 (SD 7.6)	13.5 (SD 15.4)	−4.9 P=0.02	10.9 (SD 4.4)	10.3 (SD 4.3)	0.65 P=25

Note: ESS, Epworth Sleepiness Scale; SD, standard deviation; TRD, tongue repositioning device