7.
1:1卡钳法倾向值匹配研究（Propensity-Matched Study, PSM）
1:1 Caliper Propensity-Matched Study results
| Factor | Non-Chemo group (n =158) | Chemo group (n =158) | P value |
| 注：本表得到版权所有者©2011-2016 Journal of Thoracic Disease复制许可。 | |||
| Gender | 0.816 | ||
| Male | 100 | 98 | |
| Female | 58 | 60 | |
| Myasthenia gravis | 0.489 | ||
| Yes | 21 | 17 | |
| No | 137 | 141 | |
| WHO type three classifications | 0.709 | ||
| A+AB | 8 | 8 | |
| B1+B2+B3 | 62 | 55 | |
| C+NETT | 88 | 95 | |
| Pathological staging | 0.496 | ||
| Ⅲ | 121 | 126 | |
| Ⅳ | 37 | 32 | |
| Resection status | 0.224 | ||
| R0 | 91 | 82 | |
| R1 | 22 | 17 | |
| R2 | 45 | 59 | |
| Adjuvant radiotherapy | 0.458 | ||
| No | 25 | 30 | |
| Yes | 133 | 128 | |