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Statistics of general clinical data of patients.
| Items | Control group (n = 59) | Experiment group (n = 59) | |
|---|---|---|---|
| Gender | Male (n) | 37 | 34 |
| Female (n) | 22 | 25 | |
| Age (years old) | 54.32 ± 13.45 | 56.71 ± 11.05 | |
| Education level | Junior high school or below (n) | 28 | 24 |
| High school or junior college (n) | 17 | 21 | |
| Bachelor degree or above (n) | 14 | 14 | |
| History of smoking | Smokers (n) | 47 | 44 |
| Nonsmoker (n) | 12 | 15 | |
