Table 4. Statistically significant differences among the mean peak area of identified VOCs in exhaled breath study groups .

Pair groups	C-N	C-P	C-S	N-P	N-S	P-S
Acetaldehyde	0.026	0.050	0.048	0.003	0.801	0.015
2-methyle propane	0.014	0.232	0.001	0.999	0.912	0.995
Ethylamine	0.987	0.068	0.038	0.105	0.087	0.741
2-methyle 1-proanol	0.088	1.000	1.000	0.515	0.066	1.000
2-pentene	0.582	0.056	0.001	0.259	0.030	0.991
Isoprene	0.046	0.984	0.032	0.042	0.987	0.034
Acetone	0.256	0.792	0.042	0.247	0.771	0.078
2-propanol	0.001	0.237	0.046	0.003	0.888	0.001
1-3 cyclopentadiene	1.000	0.021	0.001	0.021	0.001	0.855
1-3 cyclohexadiene	0.802	1.000	0.023	0.953	0.204	0.366
Decane	0.004	0.713	0.011	0.765	0.958	0.983
Acetonitrile	0.712	0.173	0.001	0.050	0.001	0.970
3-methyle pentane	0.548	0.610	0.049	0.967	0.997	0.998
Butene	1.000	0.852	0.991	0.848	0.793	0.761
1-3 butadiene	0.001	0.999	0.987	0.035	0.001	0.985
2-4 hexadiene	0.437	0.815	0.001	1.000	0.001	0.004
3-chloro methane	0.238	1.000	1.000	0.693	0.198	1.000
Octane	0.269	0.111	0.004	0.607	0.368	0.986
Benzene	0.662	0.236	0.031	0.049	0.001	0.983
Acetic acid	0.788	9.468	0.968	0.789	0.479	0.308
2-5 dimethyl furan	0.452	0.048	0.001	0.005	0.001	1.000
Propanthiol	0.001	0.184	0.001	0.944	0.439	0.499
3-hydroxy 2-butanone	0.006	0.003	0.001	0.359	0.037	0.999
Heptanoic acid	0.128	0.125	0.006	0.779	0.720	0.981
Nitro propane	1.000	0.001	1.000	0.001	1.000	0.001
Toluene	0.996	0.817	0.005	0.879	0.010	0.727
Hexanal	0.001	0.282	0.001	0.001	0.786	0.001
Pentadecane	0.001	0.015	0.001	0.993	0.515	0.720
Butanoic acid	0.001	1.000	0.999	0.027	0.001	0.999
Ethyl benzene	0.132	0.036	0.986	0.001	0.204	0.014
Xylene	0.351	0.009	0.204	0.001	0.002	0.012
2-heptanone	0.880	1.000	0.563	0.937	0.953	0.886
Styrene	0.976	0.010	0.681	0.019	0.905	0.044
Furan methanol	0.077	0.493	0.187	1.000	0.945	0.990
Dimethyl benzene	0.015	0.002	0.007	0.050	0.760	0.021
Nonanal	0.003	0.038	0.047	0.001	0.512	0.001

C: Exposure group N: Negative control P: Positive control S: Smoker group