Table 2. The correlation analysis of apnea-hypopnea index with obstructive sleep apnea risk factors and symptoms.

*Data was analyzed by Pearson’s correlation coefficient test; ** Data was analyzed by Spearman’s correlation coefficient test; BMI: body mass index

Parameters	Apnea-Hypopnea Index
	OSA patients (n=328)
	r	p-value
Lowest saturation(%)*	-0.63	<0.001
Average saturation(%)*	-0.51	<0.001
Time SpO2 under 89(%)*	0.47	<0.001
Age(years)*	0.15	0.006
Weight(kg)*	0.37	<0.001
BMI*	0.24	<0.001
Gender	0.17	0.002
Morning headache**	0.19	0.001
Heart failure **	-0.11	0.045
Hypertension**	0.1	0.073
Exercise**	-0.03	0.550
Snoring **	0.06	0.262
Daytime sleepiness**	0.07	0.218