Table 3.

Concentration of volatile sulphur compounds (ng/10 ml) at baseline (T0), after 12 hr (T1) and after 2 weeks (T2)

		Experimental group	Control group	p value
H2S	T0	6.00 ± 5.90	5.98 ± 5.34	0.94b
	T1	3.69 ± 4.78	5.71 ± 5.21	<0.001b
	p value	<0.001a	0.11a
	T2	1.07 ± 0.84	5.61 ± 4.87	<0.001b
	p value	<0.001a	0.06a
	ΔT1–T0	−2.31 ± 2.08	−0.27 ± 1.05	<0.001b
	ΔT2–T0	−4.94 ± 5.59	−0.37 ± 1.22	<0.001b
	p value	0.001a	0.64a
CH3SH	T0	2.55 ± 2.07	2.65 ± 2.19	0.85b
	T1	1.53 ± 1.92	2.43 ± 1.91	<0.001b
	p value	<0.001a	0.10a
	T2	0.63 ± 0.69	2.38 ± 1.97	<0.001b
	p value	<0.001a	0.12a
	ΔT1–T0	−1.02 ± 1.09	−0.22 ± 0.83	<0.001b
	ΔT2–T0	−1.92 ± 1.81	−0.27 ± 1.08	<0.001b
	p value	0.002a	0.58a

Note. Data are presented as means ± SD.

^a Paired t test.

^b Independent t test; significance at p < 0.05.