Table 1.

Demographic characteristics of patients

Category	Group A	Group B	Group C	Group D
Number (n)	39	35	34	39
Age (yr)	44.4 ± 14.2	44.1 ± 14.4	47.8 ± 13.9	48.7 ± 16.5
Gender (M:F)	18:21	18:17	16:18	18:21
Indication
Cancer screening	9	9	7	10
Dyspepsia	20	17	18	22
Acid regurgitation	10	9	9	7

No significant difference between each two groups. Group A received dimethylpolysiloxane, group B received dimethylpolysiloxane plus water, group C received pronase, sodium bicarbonate, and dimethylpolysiloxane plus water, and group D received N-acetylcysteine and dimethylpolysiloxane plus water.