Table 1 Patient characteristics at baseline
| Characteristic | Experimental group (N = 80) | Control group (N = 80) | Statistics | P |
|---|---|---|---|---|
| Age (years) | 59.70 ± 8.12 | 59.33 ± 9.66 | t = 0.275 | 0.784 |
| Sex | χ2 = 0.040 | 0.841 | ||
| Male | 64 | 65 | ||
| Female | 16 | 15 | ||
| Smoking history | χ2 = 0.417 | 0.519 | ||
| Smoker | 50 | 46 | ||
| Never smoker | 30 | 34 | ||
| Stage | χ2 = 0.740 | 0.786 | ||
| Extensive stage | 7 | 8 | ||
| Limited stage | 73 | 72 |