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Table 2 Average values (standard deviation (s.d.)) of outcome variables during the four recording nights

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