Table 2.
Relative differences in compounds of interest between cancer and control patient groups.
| Exhaled compounds | Controls (n = 61) | Cancer (n = 74) | p value | ||
|---|---|---|---|---|---|
| Median | Range | Median | Range | ||
| Hydrogen (ppm) | 5.00 | 0–97 | 5.00 | 0–33 | 0.616 |
| Methane (ppm) | 3.00 | 0–50 | 5.00 | 0–58 | 0.697 |
| CH4/H2 ratio | 0.39 | 0–6.71 | 0.67 | 0–17.67 | 0.044* |
| Acetic acid (ppm) | 0.31 | 0.05–6.66 | 0.28 | 0.05–4.79 | 0.620 |
| Butanoic acid (ppm) | 0.01 | 0–0.08 | 0.01 | 0–0.13 | 0.763 |
| Formic acid (ppm) | 0.11 | 0.04–13.40 | 0.13 | 0.04–3.14 | 0.620 |
| Propanoic acid (ppm) | 0.02 | 0–0.12 | 0.02 | 0–0.04 | 0.887 |
Mann Whitney-U test for independent samples and Chi squared testing for contingency tables, BMI Body Mass Index, ppm parts per million, *Statistical significance (p < 0.05).