In a study of 2000 US veterans, all-cause mortality was more than 80% higher in in HIV-positive smokers than HIV-positive never-smokers whether they smoked under 20 pack-years
* or over 20 pack-years
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.
4 years and [greater than or equal to] 30 pack-year
history of smoking, with a mean of 56 pack-years
That means current smokers aged 55 to 74 with more than 30 pack-years
of smoking, or former smokers with that profile who have quit within the last 15 years, said the American College of Chest Physicians.
There was no significant difference when comparing the prevalence of various comorbidities such as type 2 diabetes mellitus, obesity, smoking, and alcohol consumption between Caucasians and African Americans, except for slight differences in alcohol consumption of greater than 40 gm/day in African Americans (26%) versus Caucasians (20%) and in cigarette smoking of greater than 60 pack-years
in Caucasians (4.
In the aforementioned survey, over half of the respondents acknowledged that they now include at least one of the two essential pack-year
questions, while 18% are asking ex-smokers why they quit.
But those who smoke three packs a day for ten years, or two packs a day for 15 years, are also considered 30 pack-year
So 1 pack-year
means smoking 1 pack per day for 1 year, or 2 packs daily for a half-year.
a 30 pack-year
history of tobacco smoking (an average of one pack a day for 30 years), and who have a written order from a physician or qualified non-physician practitioner.
Preventive Services Task Force (USPSTF) has recommended annual low-dose CT (LDCT) lung cancer screening for adults ages 55 through 79 who have a 30 pack-year
history of smoking or who have quit smoking in the past 15 years.
Current daily smokers at least for one pack-year
and cases with a history of at least five pack-years
were accepted as smokers.