Table 2. Concentration of half-maximal inhibition (IC₅₀) of H. rosa-sinensis flower ethanol (EtOH) extract, fractions, and thiourea on H. pylori ATCC 43504 urease inhibition.

Sample	Slope±SE	IC50, mg/mL (95%CI)
EtOH extract	2.304±0.096	2.144 (2.100-2.190)
Hexane fraction	-	-
EtOAc fraction	2.203±0.039	0.101 (0.100-0.107)
Water fraction	1.875±0.064	0.431 (0.415-0.447)
Thiourea	1.861±0.107	0.044 (0.042-0.047)

CI: confidence interval; -: no inhibition; EtOAc: ethyl acetate.