Your patient has smoked 1.5 packs of cigarettes a day for the past 15 years. Prior to that he smoked 3.5 packs of cigarettes a day for 30 years. You record his pack/year history as
a. 22.5 c. 105.
b. 67.5 d. 127.5.
D
The quantity of cigarette smoking is usually described in pack/year history. To calculate the patient's pack/year history, multiply the number of packs of cigarettes smoked on a daily basis by the number of years that the patient has smoked.
pack/year history = 1.5 x 15 = 22.5
= 3.5 x 30 = 105
Total pack/year history = 22.5 + 105 = 127.5
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