Question

A 70-year-old with long-standing smoking history meets USPSTF criteria. Which of the following correctly defines a 'pack-year'?

Accepted Answer

Packs per day × years smoked

Answer

Number of years smoked only

Answer

Number of packs per day only

Answer

Cigarettes per day ÷ years smoked

Answer

Cigarettes per week × years smoked

Practice question

A 70-year-old with long-standing smoking history meets USPSTF criteria. Which of the following correctly defines a 'pack-year'?