TABLE 5. Comparison of pre and late (15 years) endoscopic findings.

Variables	Assessment
	Pre		Late post
	fi	%	fi	%	p*
Esophagitis					<0.001
Yes	30	75.0	3	10.3
No	10	25.0	26	89.7
Total	40	100.0	29	100.0
Axial hiatal hernia					<0.001
Yes	39	97.5	2	6.9
No	1	2.5	27	93.1
Total	40	100.0	29	100.0

f_i=absolute simple frequency; *p value in bold indicates statistical difference between proportions at 5% (p<0.05), using exact Fisher’s test