Results of exhaled determination in the observation and control group
| CRC group | Control group | P value | |
| Number of people (male/female) | 57（37/20） | 80 (38/42) | 0.044 |
| Age | 60±14.14 | 54±15.45 | 0.027 |
| Nasal exhaled H2S (ppb) | 20.02±15.82 | 10.41±4.45 | <0.001 |
| Oral exhaled H2S (ppb) | 47.51±27.78 | 26.32±19.07 | <0.001 |
Statistically significant difference between groups, p < 0.05.
Data represented as mean±SEM.