Table 1 Statistic tests of demographic, questionnaire, and PSG data obtained from patients across four stages of severity based on AHI value

Patient No. (%)

616 (100%)

72 (11.7%)

127 (20.6%)

132 (21.4%)

285 (46.3%)

Female

141 (22.9%)

32 (44.4%)

49 (38.6%)

31 (23.5%)

29 (10.2%)

χ² = 62.801, p < 0.001

Male

475 (77.1%)

40 (55.6%)

78 (61.4%)

101 (76.5%)

256 (89.8%)

Age^***

45.2 ± 12.7

36.2 ± 10.2

42.1 ± 11.5

45.9 ± 12.8

48.4 ± 12.5

(1) < (2),(3),(4); (2) < (4)

BMI^***

26.74 ± 4.24

23.88 ± 3.15

25.60 ± 3.75

26.18 ± 3.68

28.22 ± 4.33

(1),(2),(3) < (4)

NC^***

39.08 ± 3.65

36.24 ± 3.25

37.53 ± 3.52

38.69 ± 3.19

40.79 ± 3.10

(1) < (3); (1),(2),(3) < (4)

ESS^**

9.21 ± 5.24

7.67 ± 5.16

8.54 ± 4.77

9.19 ± 5.25

9.93 ± 5.34

(1) < (4)

ODI parameter

ODI2^***

37.58 ± 23.50

10.25 ± 7.18

19.81 ± 10.57

29.60 ± 12.31

56.11 ± 18.94

(1) < (2) < (3) < (4)

ODI3^***

26.16 ± 23.93

3.10 ± 2.78

8.18 ± 6.02

15.54 ± 8.87

44.92 ± 22.37

(1) < (2) < (3) < (4)

ODI4T^***

20.44 ± 23.06

1.28 ± 1.43

4.18 ± 3.80

9.52 ± 7.01

37.58 ± 23.66

(1) < (2) < (3) < (4)

ODI4A^***

24.65 ± 26.00

1.14 ± 1.41

5.20 ± 3.94

12.01 ± 7.62

45.10 ± 24.97

(1) < (2) < (3) < (4)

Heart Rate

73.32 ± 11.02

70. 31 ± 8.45

71.05 ± 10.61

72.64 ± 9.50

75.41 ± 11.97

(1),(2) < (4)

TST (min)^***

309.0 ± 63.4

317.8 ± 56.3

331.3 ± 48.9

307.6 ± 58.5

297.5 ± 69.8

(3),(4) < (2)

Latency (min)^***

19.6 ± 21. 1

27. 6 ± 33.0

16.2 ± 13.6

22.4 ± 23.2

17.9 ± 18.2

(2),(4) < (1)

Arousal count^***

153.9 ± 99.1

95.3 ± 55.6

103.0 ± 52.3

121.1 ± 52.3

206.5 ± 112.4

(1),(2),(3) < (4)

Arousal Index^***

33.6 ± 20.7

19.3 ± 10.8

20.6 ± 10.1

26.6 ± 11.2

46.3 ± 21.9

(1),(2),(3) < (4); (1) < (3)