Table 4.

VOCs affected by menstrual cycles.

	VOC	Functional group	Kruskal-Wallis	Steel-Dwass
			p-value	p-value	Phase
Cubital fossa
	3-hydroxy-3-methylhexanoic acid	Fatty acid	0.007	0.005	M-P
			0.007	0.070	LL-P
	Propanal	Aldehyde	0.008	0.003	LL-M
	1-hexanol	Alcohol	0.018	0.021	LL-M
	Butytic acid	Fatty acid	0.025	0.020	M-ML
	Heptanal	Aldehyde	0.037	0.020	LL-ML
	2-decanone	Ketone	0.037	0.069	M-P
	Methyl mercaptan	Sulfur compound	0.038	ND
	3-methyl-2-hexenoic acid	Fatty acid	0.063	ND
	Ethyl mercaptan	Sulfur compound	0.065	0.049	M-ML
	1-octanol	Alcohol	0.068	ND
	2-nonanone	Ketone	0.098	ND
Armpit
	Heptanoic acid	Fatty acid	0.011	0.046	P-ML
				0.072	LL-ML
	Propanal	Aldehyde	0.031	0.033	LL-M
			0.031	0.057	M-P
	2-dodecanone	Ketone	0.044	0.067	LL-ML
	Hexanoic acid	Fatty acid	0.044	ND
	Propionic acid	Fatty acid	0.047	0.046	M-ML
	2-nonanone	Ketone	0.088	0.071	M-ML
	1-heptanol	Alcohol	0.089	ND
	Allyl methyl disulfide	Sulfur compound	0.098	ND

LL: late luteal; M: menstrual; ML: middle luteal; ND: no statistical difference; P: preovulatory; VOC: volatile organic compound.