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Comparison of basic conditions of the 2 groups of patients.
| Groups | Gender (male/female, n) | Age (x ± s, yr) | Follow-up time (mo) |
| Observation group | 16/14 | 46.40 ± 2.67 | 12 |
| Control group | 15/15 | 46.17 ± 2.34 | 12 |
| χ2/t value | 0.067 | 0.360 | |
| P-value | .796 | .720 |
