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Association between smoking index and tumor grade.
| Group | Number of patients | % |
|---|---|---|
| Smoking index ≥600 | 175 | |
| Well-differentiated tumor | 59 | 33.7 |
| Moderately-differentiated tumor | 85 | 48.6 |
| Poorly-differentiated tumor | 31 | 17.7 |
| Smoking index <600 | 134 | |
| Well-differentiated tumor | 62 | 46.3 |
| Moderately-differentiated tumor | 54 | 40.3 |
| Poorly-differentiated tumor | 18 | 13.4 |
