Table 3.
Baseline data
| Factors | CG (n=69) | RG (n=73) | t/χ2 | P | |
|---|---|---|---|---|---|
| Age/years old | 74.25±5.16 | 75.28±5.10 | 1.196 | 0.234 | |
| Gender | Male | 45 (65.22) | 53 (72.60) | 0.905 | 0.342 |
| Female | 24 (34.78) | 20 (27.40) | |||
| BMI (kg/m2) | 22.31±2.07 | 21.78±2.14 | 1.499 | 0.136 | |
| Course of disease (years) | 9.68±1.64 | 9.36±1.57 | 1.188 | 0.237 | |
| Staging | |||||
| Stationary phase | 47 (68.12) | 58 (79.45) | 2.366 | 0.124 | |
| Acute exacerbation period | 22 (31.88) | 15 (20.55) | |||
| Dust contact history | |||||
| Yes | 39 (56.52) | 33 (45.21) | 1.817 | 0.178 | |
| No | 30 (43.48) | 40 (54.79) | |||
| Smoking history | |||||
| Yes | 42 (60.87) | 49 (67.12) | 0.603 | 0.438 | |
| No | 27 (39.13) | 24 (32.88) | |||
| Alcoholism history | |||||
| Yes | 38 (55.07) | 42 (57.53) | 0.087 | 0.768 | |
| No | 31 (44.93) | 31 (42.47) | |||
| Place of residence | |||||
| City | 29 (42.03) | 41 (56.16) | 2.836 | 0.092 | |
| Rural area | 40 (57.97) | 32 (43.84) |