Table 2.

Factors associated with the severity of OSAS among all the participants by univariate linear regression analyses.

Variables	Standardized coefficients beta	Adjusted R square	Statistics value	P
Gender	0.345	0.117	8.206	0.000**
Age	0.001	− 0.002	0.018	0.986
ESS scoring	0.278	0.076	6.449	0.000**
Height	0.255	0.063	5.889	0.000**
Weight	0.523	0.272	13.693	0.000**
BMI	0.520	0.269	13.606	0.000**
SBP before sleep	0.324	0.103	7.628	0.000**
DBP before sleep	0.312	0.096	7.309	0.000**
SBP awake in the morning	0.394	0.153	9.360	0.000**
DBP awake in the morning	0.411	0.167	9.852	0.000**
Latent period
N1	− 0.157	0.023	− 3.555	0.000**
N2	− 0.084	0.005	− 1.889	0.059
SWS	0.172	0.028	3.912	0.000**
REM	− 0.116	0.011	− 2.611	0.009**
Duration
REM	0.005	− 0.002	0.115	0.908
NREM	0.035	− 0.001	0.788	0.431
SWS	− 0.157	0.023	− 3.555	0.000**
TST/TIB (%)	0.089	0.006	1.995	0.047**
SpO2 (%)
Average	− 0.435	0.187	− 10.791	0.000**
Minimum	− 0.739	0.545	− 24.529	0.000**
Supine duration	0.099	0.008	2.234	0.026**

SBP systolic blood pressure, DPB diastolic blood pressure, BMI body mass index, ESS Epworth sleepiness scale, TST total sleep time, TIB time in bed.

**P value < 0.05.