Table 2. The mean sum grade before and after treatment in both NG and P of horses.

Groups	Before treatment	After treatment	p value
RT28 NG	8.7 ± 2.4 (n = 7)	3.9 ± 1.2 (n = 7)	< 0.001*
RT28 P	3.3 ± 2.6 (n = 7)	2.4 ± 1.0 (n = 7)	0.231
RT28	6.0 ± 3.7 (n = 14)	3.1 ± 1.3 (n = 14)	0.003†
OT28 NG	8.3 ± 3.0 (n = 4)	0.8 ± 1.0 (n = 4)	0.003†
OT28 P	7.8 ± 1.3 (n = 4)	1.0 ± 0.8 (n = 4)	< 0.001*
OT28	8.0 ± 2.1 (n = 8)	0.9 ± 0.8 (n = 8)	< 0.001*

NG, non-glandular region; P, pyloric region; RT28, 28th day reassessment after administration of ranitidine 6.6 mg/kg PO, t.i.d.; OT28, 28th day reassessment after administration of omeprazole 4.0 mg/kg PO, s.i.d.

^*p < 0.001; ^†p < 0.01.