Table 1.
Associations between clinical characteristics and EGFR mutation
| Variables | N | EFGR | ||
|---|---|---|---|---|
| Mutation | Wild | P | ||
| Age (year) | ||||
| Mean ± SD | 58.8 ± 7.4 | 58.9 ± 6.2 | 0.918 | |
| Gender | ||||
| Female | 161 | 85 | 76 | 0.000 |
| Male | 215 | 68 | 147 | — |
| Smoking history | ||||
| Never | 210 | 114 | 96 | 0.000 |
| Former/current | 166 | 39 | 127 | — |
| Tumor size (cm) | ||||
| Mean ± SD | 2.93 ± 0.81 | 2.89 ± 0.75 | 2.95 ± 0.84 | 0.571 |
| TNM stage | ||||
| I | 180 | 80 | 100 | 0.250 |
| II | 94 | 38 | 56 | — |
| III + IV | 102 | 35 | 67 | — |
| LNM (N1, N2) | ||||
| Yes | 139 | 56 | 83 | 0.903 |
| No | 237 | 97 | 140 | — |
| Differentiation | ||||
| Poor | 114 | 29 | 85 | 0.000 |
| Moderate | 177 | 71 | 106 | — |
| Well | 85 | 53 | 32 | — |
EGFR, epidermal growth factor receptor; LNM, lymph node metastasis; SD, standard deviation; TNM, tumor node metastasis.