pack-years associated_with cigarettes
Evidence from:
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all sources
Evidence (2 sources)
Genetic and environmental contributions to the relationships between brain structure and average lifetime cigarette use.
(2015)
PMID:25690561
cited
Pack-years, defined as average cigarette use over years of smoking. Pack-years was calculated ... number of cigarettes smoked per day multiplied by the number of years smoked.
confidence: 0.94
Genome-wide and candidate gene association study of cigarette smoking behaviors.
(2009)
PMID:19247474
cited
Pack years was derived by converting cigarettes per day to packs per day ...
confidence: 0.90