pack years

A crude indicator of a person's cumulative cigarette consumption, which is equal to the number of packs (assuming 20 cigarettes per pack) of cigarettes smoked/day, multiplied by years of consumption

pack years

(pak yērz)
Person's cigarette consumption calculated as the packs of cigarettes smoked per day, multiplied by the length of consumption in years (e.g., 1.5 packs of cigarettes smoked per day for 20 years is 30 pack years).
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Five pack years over a lifetime is the lower threshold -- below which the extra risk of cancer from smoking is fairly small.
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.
Last year, for instance, the National Comprehensive Cancer Network (NCCN) recommended that people 50 (not 55) or older who have at least 20 (not 30) pack years of smoking plus one additional risk factor, such as having chronic obstructive pulmonary disorder or a close relative with lung cancer, also be screened.
The guidelines, released in May, recommend yearly CT scans for people age 55-74 who have smoked for 30 pack years or more (e.
Conclusion In our study, smoking was associated with severity of disease and mean PASI scores directly correlated with the number of pack years.
They were between 20 and 45 years of age, with smoking history of 5 pack years or more and have not been to doctor for complaints of cough or breathlessness for last 2 years.
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).
All we need to calculate pack years are three things: when they started, how much--on average--they smoke per day and, if they stopped, approximately when focus impaired risks Cigarette Smoking: Time To Upgrade The Underwriting they did so.
ALTHOUGH it may sound like just another Rat Pack show, The Kings Of Swing is more a celebration of the music of the Las Vegas Rat Pack years rather than the personalities who performed it.
There was no significant difference between the groups for age, pack years of cigarettes smoked, total joints of marijuana smoked, or race (p > 0.