Table 3 Results of the univariate analysis of the polysomnographic findings in the whole group of subjects recruited in this study, sub-grouped by sex, presence of insomnia, and diagnosis of attention-deficit/hyperactivity disorder or autism. All values are expressed as mean ± standard deviation

Age, years

12.6 ± 3.35

14.3 ± 3.28

0.00006

13.6 ± 3.28

13.9 ± 4.07

NS

13.9 ± 3.49

13.0 ± 3.13

NS

13.7 ± 3.34

12.9 ± 3.81

NS

Total sleep time, min

421.4 ± 78.64

406.5 ± 80.25

NS

413.2 ± 79.58

408.3 ± 81.83

NS

410.0 ± 81.39

418.7 ± 75.84

NS

412.4 ± 78.61

413.1 ± 89.45

NS

Sleep latency, min

32.2 ± 42.27

32.5 ± 32.45

NS

30.6 ± 29.45

42.2 ± 63.02

0.016

33.3 ± 38.53

30.2 ± 31.66

NS

32.5 ± 35.92

31.5 ± 42.33

NS

Sleep efficiency, %

81.1 ± 15.92

80.9 ± 13.95

NS

80.9 ± 14.6

81.5 ± 15.72

NS

80.8 ± 14.45

81.4 ± 15.55

NS

81.4 ± 14.35

77.4 ± 17.28

NS

Stage N1, %

11 ± 7.08

11.4 ± 7.71

NS

11.6 ± 7.64

9.2 ± 5.98

NS

11.4 ± 7.72

10.8 ± 6.77

NS

11.2 ± 7.35

11.8 ± 8.24

NS

Stage N2, %

44.3 ± 11.05

50.3 ± 10.32

0.00013

48.1 ± 10.77

47.1 ± 12.34

NS

48.3 ± 11.19

47 ± 10.54

NS

47.9 ± 11.07

47.8 ± 10.64

NS

Stage N3, %

29.5 ± 11.25

23.7 ± 9.13

0.0034

25.4 ± 9.77

29.4 ± 13.09

0.017

25.2 ± 10.64

28 ± 9.62

NS

25.8 ± 10.35

27.8 ± 10.92

NS

Stage R latency

181.1 ± 100.6

174.8 ± 108.52

NS

179.3 ± 106.57

166.2 ± 98.11

NS

168.5 ± 103.1

199.2 ± 108

0.045

171.5 ± 99.15

221.1 ± 136.86

0.0032

Stage R, %

15.2 ± 7.25

14.5 ± 6.78

NS

14.9 ± 6.93

14.1 ± 7.25

NS

15 ± 7.23

14.2 ± 6.29

NS

15.1 ± 6.81

12.8 ± 7.87

0.022

PLMS index, n/hour

4.6 ± 8

2.6 ± 5.93

0.019

3.7 ± 7.27

1.8 ± 3.88

NS

3.3 ± 7.26

3.8 ± 5.94

NS

3.4 ± 7.04

3.2 ± 5.77

NS

Obstructive AHI, n/hour

6.6 ± 16.1

3.7 ± 6.38

0.0017

5.2 ± 12.1

3.3 ± 6.23

NS

5.3 ± 13.1

3.9 ± 5.25

NS

4.3 ± 6.88

9.3 ± 27.29

0.01

Central AHI, n/hour

1.5 ± 3.59

1.7 ± 10.14

NS

1.8 ± 8.83

0.8 ± 1.17

NS

1.5 ± 7.1

1.9 ± 10.33

NS

1.7 ± 8.67

0.9 ± 1.07

NS