Table 3.
Clinical, demographic and polysomnographic characteristics of healthy controls and OSAS subgroups
| Healthy controls (n = 34) | OSAS-low hypoxemia (n = 24) | OSAS-high hypoxemia (n = 30) | p | |
|---|---|---|---|---|
| Age | 36.97 ± 10.83 | 38.04 ± 7.43 | 39.67 ± 7.47 | .484 |
| Gender (M/F) | 31/3 | 23/1 | 30/0 | .238 |
| Education (year) | 14.59 ± 1.07 | 14.08 ± 1.55 | 14.20 ± 1.34 | .300 |
| BMI (kg/m2) | 26.28 ± 2.70 | 29.42 ± 4.86 | 33.30 ± 5.68 | < .001a,b,c |
| ESS | 2.66 ± 2.91 | 8.25 ± 3.75 | 12.33 ± 5.06 | < .001a,b,c |
| BDI | 7.21 ± 5.25 | 8.08 ± 5.80 | 9.47 ± 5.51 | .263 |
| AHI (events/h) | – | 45.93 ± 16.15 | 68.01 ± 19.47 | < .001a |
| Total sleep time (min) | – | 444.40 ± 43.67 | 431.81 ± 52.56 | .351 |
| Time with O2 < 90% (%) | – | 3.03 ± 4.18 | 28.25 ± 22.37 | .001 a |
| Time with O2 < 80% (%) | – | – | 7.34 ± 10.91 | NA |
| Sleep efficiency (%) | – | 90.74 ± 7.11 | 90.47 ± 6.56 | .884 |
Bold values indicate statistically significant differences between groups
Data are presented as mean ± standard deviation (SD). p values were obtained from One-Way ANOVA and Chi Square test for continuous and categorical data respectively
OSAS obstructive sleep apnea, M male, F female, BMI body-mass index, ESS Epworth Sleepiness Scale, BDI Beck’s depression inventory, NA non-applicable
Significant differences between groups were symbolized with: aHealthy controls versus OSAS low hypoxemia, bHealthy controls versus OSAS high hypoxemia, cOSAS low hypoxemia versus OSAS high hypoxemia