Table 4.

Inhibition of nitric oxide production due to varying concentrations of Cousinia thomsonii extracts and their IC₅₀ values

Treatment	% Inhibition at different concentrations			IC50  (μg/mL)
	100 μg/mL	300 μg/mL	600 μg/mL
Hexane extract	34.18±1.70ns	41.63±2.08*	52.72±2.63*	526.38±26.31ns
Aqueous extract	37.63±1.88ns	46.45±2.32*	58.63±2.93*	391.34±19.56ns
Methanol extract	40.61±2.49*	57.76±2.88*	66.63±3.33**	233.86±11.69*
Ethanol extract	43.25±3.20*	69.60±3.48**	73.23±3.66***	119.26±5.96***
Ethyl acetate extract	46.21±3.31*	72.72±3.63**	77.49±3.87***	70.52±3.52***
Gallic acid	50.0±3.50*	77.47±3.77**	89.60± 4.08***	39.70±1.98***

Notes: Each value represents the mean ± standard deviation of three independent experiments. *P<0.05; **P<0.01; ***P<0.001; ^ns(P>0.05.