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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