From: Effects of invisible orthodontic retainers on masticatory muscles activity during sleep: a controlled trial
Outcome variable
Average values (s.d.)
Range
SB index
3.3 (1.7)
0.2–7.9
Total number of sMMA events
73.4 (61.3)
6–438.1
Phasic sMMA events per hour
7.4 (5.0)
0–20
Tonic sMMA events per hour
5.0 (4.6)
0–17
Mixed sMMA events per hour
1.4 (1.7)
0–6.0