Table 3.
Mann-Whitney U test compares Z values of 23 VOCs in the lung cancer and healthy control groups.
| Name | Kovarts index (KI) | Mean rank | U | Z | P | |
|---|---|---|---|---|---|---|
| Control | Lung cancer | |||||
| Dimethylmethane | 304 | 65.50 | 70.87 | 2088.0 | −2.426 | 0.015 |
| Ethanol | 460 | 60.23 | 76.87 | 1708.5 | −2.470 | 0.014 |
| Methane | 483 | 65.29 | 71.11 | 2073.0 | −1.989 | 0.047 |
| Isoprene | 520 | 67.24 | 68.88 | 2213.0 | −0.271 | 0.786 |
| Hexane | 600 | 60.79 | 76.25 | 1749.0 | −2.321 | 0.020 |
| Methylcyclopentane | 627 | 68.35 | 67.61 | 2243.0 | −0.113 | 0.910 |
| Benzene | 654 | 67.17 | 68.93 | 2208.5 | −0.266 | 0.790 |
| Heptane | 700 | 73.17 | 62.11 | 1896.0 | −1.642 | 0.101 |
| 2-methylheptane | 763 | 69.49 | 66.26 | 2160.5 | −0.636 | 0.525 |
| Octane | 800 | 72.53 | 62.82 | 1942.0 | −1.438 | 0.150 |
| 3-methyloctane | 871 | 67.51 | 68.57 | 2232.5 | −0.157 | 0.875 |
| 1,4-dimethylbenzene | 877 | 69.65 | 66.14 | 2149.0 | −0.662 | 0.508 |
| 3-methylnonane | 900 | 65.40 | 70.93 | 2081.0 | −0.826 | 0.409 |
| Ethenylbenzene | 915 | 65.04 | 71.39 | 2055.0 | −0.949 | 0.343 |
| 2.2.4.6.6-pemtamethylheptane | 997 | 53.69 | 84.34 | 1238.0 | −4.543 | 0.000 |
| Limonene | 1038 | 72.68 | 62.66 | 1931.0 | −1.486 | 0.137 |
| 2,5,5-trimethyl-2,6-heptadien-4-one | 1063 | 77.22 | 57.48 | 1604.5 | −2.926 | 0.003 |
| 1-isopropyl-4-methylbicyclo[3.1.0]hexan-3-ol | 1133 | 55.71 | 82.04 | 1383.0 | −3.904 | 0.000 |
| Dodecane | 1200 | 61.27 | 75.68 | 1783.5 | −2.137 | 0.033 |
| Tridecane | 1300 | 69.31 | 66.52 | 2174.0 | −0.416 | 0.677 |
| Tetradecane | 1400 | 65.31 | 71.07 | 2074.5 | −0.853 | 0.393 |
| 2-phenylpropylbutyrate | 1484 | 67.97 | 68.03 | 2266.0 | −0.009 | 0.993 |
| 1,2,6-trimethylnaphthalene | 1552 | 75.06 | 59.94 | 1760.0 | −2.241 | 0.025 |