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Table 2 The points of the exposure index

From: p53 in head and neck cancer: Functional consequences and environmental implications of TP53mutations

Tobacco exposure description Alcohol exposure description Chemical/dust
exposure description
0 Non-smoker No alcohol consumption No exposure
1 Pack years 1-10 Occasionally (1-2 times/month)  
2 Pack years 11-45 Weekly (1-2 times/week) Exposure to a chemical and/or dust
3 Pack years over 45 Daily (heavy drinking)