Severity of gastroesophageal reflux disease influences daytime somnolence: A clinical study of 134 patients underwent upper panendoscopy

Table 3 Linear regression and dependent variable: Epworth index

	Reference: GERD 0			Reference: GERD III
	& control variables			& control variables			Reference: GERD 0			Reference: GERD III
	B	t-stat	Signif	B	t-stat	Signif	B	t-stat	Signif	B	t-stat	Signif
Constant	5.210	2.370	0.019	8.743	3.653	0.000	6.708	7.748	0.000	10.769	9.155	0.000
GERD 0				-3.534	-2.410	0.018				-4.061	-2.780	0.006
GERD I	0.503	0.433	0.666	-3.031	-2.125	0.036	0.464	0.397	0.692	-3.597	-2.541	0.012
GERD II	0.635	0.610	0.543	-2.899	-2.178	0.031	0.685	0.662	0.510	-3.376	-2.586	0.011
GERD III	3.534	2.410	0.018				4.061	2.780	0.006
BMI	0.092	1.254	0.212	0.092	1.254	0.212
NEM	-0.002	-0.003	0.998	-0.002	-0.003	0.998
AGE50	-1.557	-1.999	0.048	-1.557	-1.999	0.048
n =122