Table 1.
Comparison of general information
| Group | Control group (N=53) | Research group (N=53) | χ2 | P |
|---|---|---|---|---|
| Gender (Male/Female) | 32/21 | 30/23 | 0.155 | 0.693 |
| Age (years) | 70.7±5.2 | 70.9±5.3 | 0.196 | 0.845 |
| Smoking history | 26 | 24 | 0.151 | 0.697 |
| Course of COPD | 7.96±1.33 | 7.89±1.25 | 0.279 | 0.781 |
| Course of respiratory failure | 3.26±0.92 | 3.57±0.73 | 1.922 | 0.057 |
| COPD severity classification (II/III/IV, cases) | 15/28/10 | 12/29/12 | 0.533 | 0.766 |
| BMI (kg/m2) | 25.31±3.52 | 25.63±3.61 | 0.462 | 0.645 |
| Complications (cases) | ||||
| Hypertension | 38 | 32 | 1.514 | 0.218 |
| Coronary heart disease | 29 | 27 | 0.151 | 0.697 |
| Diabetes | 11 | 12 | 0.056 | 0.814 |
| Cerebral infarction | 10 | 9 | 0.064 | 0.800 |
| Other complications | 7 | 10 | 0.631 | 0.427 |
Note: COPD: chronic obstructive pulmonary disease.