Clinical Features and Contributing Factors of Excessive Daytime Sleepiness in Chinese Obstructive Sleep Apnea Patients: The Role of Comorbid Symptoms and Polysomnographic Variables

Table 1

Demographic characteristics of the total OSA patients and the patients with different severities of EDS.

	Total	Non-EDS	Mild to moderate EDS	Severe EDS	F/χ^2
Number of cases	874	582	227	65	—	—
Gender (male : female)	739 : 135	482 : 100	203 : 24	54 : 11	5.580	0.061
Age	45.4 ± 11.6	45.2 ± 12.0	44.5 ± 10.2	49.5 ± 11.3^a,b	4.757	0.009
BMI (kg/m^2)	27.2 ± 3.4	26.8 ± 3.3	27.9 ± 3.3^c	29.1 ± 3.6^a,b	20.462	<0.0001
NC (cm)	38.4 ± 3.8	38.1 ± 4.1	38.9 ± 3.2^c	39.7 ± 3.4^a	7.347	0.001
WC (cm)	97.8 ± 9.5	96.1 ± 9.0	101.0 ± 9.5^c	102.1 ± 9.9^a	31.003	<0.0001
Awake SpO2	96.6 ± 0.9	96.6 ± 0.9	96.5 ± 0.9	96.4 ± 0.8	2.338	0.097
ESS score	8.3 ± 5.0	5.4 ± 2.6	12.8 ± 1.6^c	19.0 ± 2.0^a,b	1499.010	<0.0001

Data are presented as the number of cases or mean ± SD. ^aComparisons between non-EDS versus severe EDS groups (); ^bcomparisons between mild to moderate EDS versus severe EDS groups (); ^ccomparisons between non-EDS versus mild to moderate EDS groups (). EDS: excessive daytime sleepiness; BMI: body mass index; NC: neck circumference; WC: waist circumference; ESS: Epworth Sleepiness Scale.