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Table 4 Average values (standard deviation (s.d.)) of outcome variables over each recording night and ANOVA test for significant differences

From: Effects of invisible orthodontic retainers on masticatory muscles activity during sleep: a controlled trial

Outcome variable Night # Average values (s.d.) Range ANOVA Sig.
SB index 1 3.3 (1.6) 0.3–6.2 0.856 0.468
2 2.8 (1.5) 0.2–5.9
3 3.5 (1.7) 1.2–6.5
4 3.7 (2.2) 0.6–7.9
Total number of sMMA events 1 84.4 (94.0) 6–438 0.323 0.809
2 72.9 (36.6) 23–153
3 71.5 (66.4) 21–311
4 64.9 (29.0) 11–130
Phasic sMMA events/hour 1 8.2 (5.5) 1–20 0.864 0.464
2 8.5 (4.9) 1–19
3 6.5 (4.2) 2–17
4 6.5 (5.3) 0–18
Tonic sMMA events/hour 1 4.9 (3.9) 0–13 0.373 0.773
2 4.5 (4.2) 1–14
3 4.5 (5.3) 0–17
4 5.9 (5.1) 0–17
Mixed sMMA events/hour 1 1.4 (1.7) 0–6 0.190 0.903
2 1.4 (1.8) 0–6
3 1.6 (1.7) 0–5
4 1.2 (1.7) 0–6