# pack-year

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## pack-year

n
(Medicine) a measure of the amount of cigarettes a person has smoked over an extended period, equal to one packet of 20 every day for one year
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Statistical significant correlation was found with the following factors: GOLD 2011 group, age, pack year, FEV1% predicted, FVC% predicted, number of acute exacerbations and hospitalized exacerbations in the past year, mMRC grade, and CAT score.
It poses--and seeks to answer--this straightforward question: Do students who outscore their peers on standardized achievement tests remain at the top of the pack year after year?
Collecting data from several recruitment sites including UC, they then divided smoking exposures into never smokers, light smokers (fewer than 20 pack years, with a pack year being the equivalent of a pack a day for 20 years), moderate smokers (20-40 pack years) and heavy smokers (40 or more pack years).
Cannabis smokers were included if they had a a lifetime exposure of at least five joint years of cannabis, and tobacco smokers were included if they had at least one pack year of tobacco.
Inclusion Criteria: Smokers of more than 3 years duration between age group of 18 years to 65 years and who have been smoking equal to or more than 1 pack year.
Insurers measure the latter as "pack years" (one pack per day for one year constitutes one pack year; two packs per day for 12 months equals two pack years, and so on).
63 Table 7: Frequency of Airtrapping in Smokers Pack Year Number of Subjects Total number % with air Trapping of Subjects 1-10 02 09 22.
For this study, the authors defined pack year by multiplying the time in years that a person had smoked, by a weighting factor for how many cigarettes a day they had smoked.
One pack year = 20 cigarettes smoked per day for a duration of one year.
Pack years: 34 patients (41%) belongs to 0-5 pack years group, 7 patients (8%) to 5-10 pack years, and 3 patients (4%) to >10 pack year.
Pack years are calculated by multiplying the number of packs of cigarettes smoked per day by the number of years you smoked.
The MDA levels in COPD patients with pack-year less than 10 years were lower and in patients with pack years 11-20 years and >20 years were statistically significant higher than the controls.
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