Table 2. Subcategories of EGFR mutations in the two groups.
| Subcategories | The younger group (%) | The older group (%) | P |
|---|---|---|---|
| EGFR mutations | 19 | 55 | 0.133 |
| E19 | 14 (73.7) | 27 (49.1) | |
| E20 | 1 (5.3) | 2 (3.6) | |
| E21 | 4 (21.0) | 26 (47.3) |
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