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肺癌的风险评估
The relative risk for lung cancer
| Low-risk | Moderate-risk | High-risk | |
| Nodule size | < 8 mm | 8 mm-20 mm | > 20 mm |
| Age (year) | < 45 | 45-60 | > 60 |
| Previous history of cancer | No | Yes | Yes |
| Smoking status | Never | Smoking now, < 1 bag/day | Smoking now, ≥1 bag/day |
| Quit smoking | Quit smoking ≥7 years | Quit smoking < 7 years | Never quit smoking |
| Chronic obstructive pulmonary disease (COPD) | No | Yes | Yes |
| Asbestos exposure | No | No | Yes |
| Nodule feature | Smooth | Lobulation | Spiculation |
