. 2016 Nov 30;2016:9273078. doi: 10.1155/2016/9273078

Table 2.

IC₅₀ values obtained by cytotoxicity assays (MTT: 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide and NR: 3-amino-7-dimethylamino-2-methylphenazine) in HeLa (treatment, T) and HepG2 (control, C) cells treated with R. officinalis (REO), C. longa (CEO), and Z. officinale (GEO) essential oils.

Essential oil	MTT-IC₅₀ (μg/mL)		IC_50C/IC_50T	p value
Essential oil	C (HepG2)	T (HeLa)	IC_50C/IC_50T	p value
REO	633.0	909.6	0.696	0.1502
CEO	614.7	211.6	3.051	0.1984
GEO	635.1	141.4	4.330	0.0549^∗∗

	NRU-IC₅₀ (μg/mL)		IC_50C/IC_50T	p-value
	C (HepG2)	T (HeLa)	IC_50C/IC_50T	p-value

REO	633.0	909.6	0.696	0.1502
CEO	614.7	36.6	16.795	0.0169^∗
GEO	635.1	129.9	4.489	0.0632^∗∗

^∗Significant difference at 5%.

^∗∗Significant difference at 10%.