Table 4.

Results of relative alpha power spectrum (RA), relative low beta power spectrum (RLB) and ratio of alpha to high beta (RAHB) using electroencephalography due to olfactory stimulation with 10 types of aroma oil.

		RA 1		RLB 2		RAHB 3
		Fp1	Fp2	Fp1	Fp2	Fp1	Fp2
		Mean ± SD 4		Mean ± SD		Mean ± SD
Lavender oil	Resting	0.222 ± 0.060	0.217 ± 0.061	0.067 ± 0.012	0.066 ± 0.012	1.582 ± 0.559	1.530 ± 0.574
	Treatment	0.271 ± 0.083	0.270 ± 0.086	0.072 ± 0.008	0.074 ± 0.009	1.925 ± 0.820	1.902 ± 0.824
	Significance 5	0.009 **	0.009 **	NS	0.026 *	NS	NS
Rosemary oil	Resting	0.222 ± 0.060	0.217 ± 0.061	0.067 ± 0.012	0.066 ± 0.012	1.582 ± 0.559	1.530 ± 0.574
	Treatment	0.257 ± 0.081	0.256 ± 0.080	0.074 ± 0.016	0.074 ± 0.013	1.891 ± 0.791	1.916 ± 0.773
	Significance	0.047 *	0.037 *	NS	0.015 *	NS	0.036 *
Rose oil	Resting	0.222 ± 0.060	0.217 ± 0.061	0.067 ± 0.012	0.066 ± 0.012	1.582 ± 0.559	1.530 ± 0.574
	Treatment	0.248 ± 0.073	0.248 ± 0.075	0.073 ± 0.012	0.074 ± 0.012	1.723 ± 0.689	1.708 ± 0.705
	Significance	NS	NS	NS	0.005 **	NS	NS
Eucalyptus oil	Resting	0.222 ± 0.060	0.217 ± 0.061	0.067 ± 0.012	0.066 ± 0.012	1.582 ± 0.559	1.530 ± 0.574
	Treatment	0.257 ± 0.076	0.257 ± 0.082	0.071 ± 0.012	0.072 ± 0.012	1.847 ± 0.668	1.815 ± 0.724
	Significance	NS	0.044 *	NS	NS	NS	NS
Jasmine oil	Resting	0.222 ± 0.060	0.217 ± 0.061	0.067 ± 0.012	0.066 ± 0.012	1.582 ± 0.559	1.530 ± 0.574
	Treatment	0.273 ± 0.085	0.271 ± 0.087	0.067 ± 0.011	0.068 ± 0.011	2.012 ± 0.709	1.975 ± 0.733
	Significance	0.033 *	0.026 *	NS	NS	0.039 *	0.029 *
Geranium oil	Resting	0.222 ± 0.060	0.217 ± 0.061	0.067 ± 0.012	0.066 ± 0.012	1.582 ± 0.559	1.530 ± 0.574
	Treatment	0.254 ± 0.074	0.256 ± 0.074	0.073 ± 0.012	0.074 ± 0.011	1.762 ± 0.731	1.787 ± 0.731
	Significance	NS	NS	0.049 *	0.009 **	NS	NS
Chamomile oil	Resting	0.222 ± 0.060	0.217 ± 0.061	0.067 ± 0.012	0.066 ± 0.012	1.582 ± 0.559	1.530 ± 0.574
	Treatment	0.257 ± 0.082	0.262 ± 0.081	0.071 ± 0.011	0.071 ± 0.009	1.890 ± 0.776	1.868 ± 0.787
	Significance	NS	0.016 *	NS	NS	NS	NS
Clary sage oil	Resting	0.222 ± 0.060	0.217 ± 0.061	0.067 ± 0.012	0.066 ± 0.012	1.582 ± 0.559	1.530 ± 0.574
	Treatment	0.269 ± 0.071	0.254 ± 0.069	0.073 ± 0.014	0.072 ± 0.012	2.062 ± 0.743	1.954 ± 0.896
	Significance	0.009 **	0.045 *	NS	NS	0.009 **	0.039 *
Thyme oil	Resting	0.222 ± 0.060	0.217 ± 0.061	0.067 ± 0.012	0.066 ± 0.012	1.582 ± 0.559	1.530 ± 0.574
	Treatment	0.258 ± 0.082	0.260 ± 0.084	0.074 ± 0.018	0.074 ± 0.017	1.891 ± 0.837	1.896 ± 0.839
	Significance	0.034 *	0.019 *	NS	NS	NS	NS
Peppermint oil	Resting	0.222 ± 0.060	0.217 ± 0.061	0.067 ± 0.012	0.066 ± 0.012	1.582 ± 0.559	1.530 ± 0.574
	Treatment	0.250 ± 0.078	0.250 ± 0.081	0.070 ± 0.015	0.070 ± 0.016	1.879 ± 0.677	1.919 ± 0.696
	Significance	NS	NS	NS	NS	NS	0.047 *

¹ RA was calculated by [alpha (8–13 Hz) power]/[total frequency (4–50 Hz) power]. ² RLB was calculated by [low beta (12–15 Hz) power]/[total frequency (4–50 Hz) power]. ³ RAHB was calculated by [alpha (8–13 Hz) power]/[high beta (20–30 Hz) power]. ⁴ SD: standard deviation. ⁵ * p < 0.05, ** < 0.01 using the Paired t-test.