Table 5. Multivariable linear regression analysis for gastroesophageal reflux disease (GERD) improvement.

*p < 0.05 denotes statistical significance, AHI: Apnea-hypopnea index; ESS: Epworth Sleepiness Scale; BMI: Body mass index.

To: Baseline, T1: After one-month, Ref: Reference variable.

Variables	Unstandardized Coefficients (B)	Standard Error	t value	p-value
					Sex (female) (Ref: male)	-0.61	0.53	-1.15	0.255
BMI (kg/m2)	-0.12	0.10	-1.23	0.224
Smoking (yes) (Ref: no)	-1.51	0.62	-2.43	0.018*
Sleep position (right) (Ref: left)	-1.42	0.60	-2.37	0.02*
Sleep position (supine) (Ref: left)	-2.16	0.84	-2.58	0.012*
AHI (T0-T1)	0.01	0.14	0.05	0.961
ESS (T0-T1)	-0.43	0.16	-2.67	0.009*
Oxygen Desaturation Index (T0-T1)	0.36	0.07	4.96	0.001*