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

Table 2 Measures of daytime somnolence by GERD groups

GERD	n	EPWORTH index	“Abnormal” EPWORTH
		Mean (Std. dev.)	> 8 Frequency
GERD 0	24	6.708 (4.639)	0.291
GERD I	29	7.172 (4.036)	0.379
GERD II	56	7.393 (3.706)	0.464
GERD III	13	10.769 (5.890)	0.769
GERD IV	12	6.166 (2.588)	0.500
Total sample	134	7.440 (4.226)	0.447

Notes: 1. The equality of the mean values for the Epworth in-dices could be rejected at 5% significance level on the basis of the Student t-tests for the following pairs of GERD groups: GERD III vs GERD II, GERD III vs GERD I, GERD III vs GERD 0, and GERD III vs GERD IV. 2. The Pearson chi-square tests for the frequencies of “abnormal” Epworth indices indicated significant differences at 5% critical value in the case of the following 2x2 tables : GERD III vs GERD II, GERD III vs GERD I, GERD III vs GERD 0.