Table 2 Polysomnography data, sleep symptoms, and physical characteristics in OSA and non-OSA groups

Total sleep time, (min)

299 ± 61.1

283.3 ± 64.8

306.8 ± 58.6

0.198

N1 + N2 (%)

57.7 (31.5–69.3)

56 (19.2–68.8)

58 (47.2–70.8)

0.328

N3 (%)

26.5 (20.3–55.9)

31.3 (20.9–67.1)

24.3 (17.9–41.5)

0.328

REM sleep time (%)

11.41 ± 5.42

11.48 ± 4.34

11.37 ± 5.94

0.944

AHI (h⁻¹)

0.9 (0.4–5.9)

7.6 (5.8–13.1)

0.5 (0.2–0.9)

0.001

OAI (h⁻¹)

0 (0–0.3)

0.6 (0–1.3)

0 (0–0)

0.001

Arousal index (h⁻¹)

13.1 (1.8–24.3)

16.9 (1.4–37.5)

12.3 (1.4–22)

0.349

REM AHI (h⁻¹)

3.3 (0–8.6)

10.3 (6.4–23.5)

1.3 (0–3.7)

0.001

Mean SaO₂ (%)

97.5 ± 1.4

96.6 ± 1.3

98 ± 1.1

0.002

Minimum SaO₂ (%)

92 (89–94)

89 (86–91)

93 (91–94)

0.002

CT90%SaO₂ (min)

0 (0–0.3)

0.2 (0–1)

0 (0–0)

0.01

Desaturation index (h⁻¹)

0.2 (0–0.9)

0.9 (0–3.4)

0.2 (0–0.5)

0.014

Nocturia n (%)

42 (82.4)

15 (88.2)

27 (79.4)

0.359

Reported apneas, n (%)

5 (10.2)

3 (17.6)

2 (6.3)

0.210

Frequent gasping awakenings, n (%)

13 (25.5)

5 (29.4)

8 (23.5)

0.65

Morning headaches n (%)

9 (17.6)

2 (11.8)

7 (20.6)

0.436

Unrefreshing sleep n (%)

25 (50)

6 (56.2)

16 (47.1)

0.311

Snoring (always/frequent) n (%)

16 (31.4)

6 (35.3)

10 (29.4)

0.670

Reported sleep time, working days (h)

7.5 (7–8)

8 (6.5–9)

7 (6.9–8)

0.109

Reported sleep time, weekends (h)

8 (7–9)

8 (7–9)

8 (7–8)

0.156

Micrognatia n (%)

1 (2)

0 (0)

1 (2.9)

1.00

Mallampati score n (%)

I–II

24 (47.1)

9 (52.9)

15 (44.1)

0.552

III–IV

27 (52.9)

8 (47.1)

19 (55.9)

Epworth sleepiness scale

6.2 ± 3

7.1 ± 3

5.8 ± 2.9

0.154