Table 1

Characteristics of patients according to the severity of OSA (n=592)*

AHI level, events/hourExact p
5–14.9
N=180
(n, %)
15–30
N=132
(n, %)
>30
N=280
(n, %)
Gender 0.046
 Female42 (23.3)40 (30.3)54 (19.3)
 Male138 (76.7)92 (69.7)226 (80.7)
Age, years0.831
 <65100 (55.6)66 (50.0)130 (46.4)
 ≥6580 (44.4)66 (50.0)150 (53.6)
BMI, kg/m2 0.001
 >3062 (34.4)58 (43.9)184 (65.7)
 18–24.930 (16.7)12 (9.1)12 (4.3)
 25–3088 (48.9)62 (47.0)84 (30.0)
ODI, events/hour0.001
 0–16172 (95.6)56 (42.4)72 (25.7)
 16.1–314 (2.2)74 (56.1)200 (71.4)
Smoking habit0.04
 Ex-smoker78 (48.1)64 (54.2)96 (46.6)
 Current smoker28 (17.3)10 (8.5)46 (22.3)
 Never smoker56 (34.6)44 (37.3)64 (31.1)
 Comorbidities
 Hypertension76 (42.2)82 (62.1)154 (55.0)0.001
 Heart diseases48 (26.7)28 (21.2)66 (23.6)0.591
 Respiratory44 (24.4)32 (24.2)48 (17.1)0.221
 Diabetes22 (12.2)26 (19.7)68 (24.3)0.001
 Anxiety/depression22 (12.2)24 (18.2)40 (14.3)0.291
 Endocrinology12 (6.7)18 (13.6)22 (7.9)0.081
 Cerebrovascular6 (3.3)8 (6.1)16 (5.7)0.361
 Lower limb arteriopathy8 (4.4)8 (6.1)8 (2.9)0.351
  • *Eyes were considered the unit of analysis.

  • AHI, Apnoea/Hypopnoea Index; BMI, body mass index; ODI, Oxygen Desaturation Index; OSA, obstructive sleep apnoea.