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mrepo:topics:adulthealthbehaviours_smoking [07/03/2018 @ 11:06]
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-Smoking<​html><​br></​html>​ 
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-Study members have been asked about their smoking habits at ages 20, 25, 31, 36, 43 and 53 years. The smoking questions distinguish between cigarettes, cigars and pipe smoking. Records are made of the ages of starting and stopping smoking and the quantities smoked.<​html><​br></​html>​ 
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-Derived variables describing smoking status based on cigarette smoking at ages 25, 31, 36, 43 and 53 years are available showing whether a study member was a current smoker, an ex smoker or had never smoked. There are also measures of the number of cigarettes smoked. 
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-Life-time Smoking Trajectory 
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-Current cigarette smoking status (‘yes’, ‘no’) and the number of cigarettes smoked per day were obtained in six waves (at ages 20, 25, 31, 36, 43 and 53 years). Study members who provided an affirmative response to being current cigarette smokers, regardless of the quantity of cigarettes smoked per day, were classified as ‘smokers’ while those who provided negative response were classified as ‘non-smoker’. From age 36 onwards research nurses obtained information on smoking during a home-interview,​ while data at earlier years were collected by postal questionnaire. <​html><​br></​html>​ Study members who provided data for at least three waves and for whom missing data are not sequential were included in the smoking trajectory variable. Study members were classified into one of four smoking trajectories:<​html><​br></​html>​ 
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-<​HTML><​li></​HTML><​HTML><​p></​HTML>​  “Never smoker”: a non smoker at all available data collections<​html><​br></​html><​HTML></​p></​HTML><​HTML></​li></​HTML>​ 
-<​HTML><​li></​HTML><​HTML><​p></​HTML>​ “Predominantly non-smoker”:​ a non smoker for at least three data collections<​html><​br></​html><​HTML></​p></​HTML><​HTML></​li></​HTML><​HTML></​ol></​HTML>​ 
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-(iii) “Predominantly smoker”: a smoker at four or more of the data collections<​html><​br></​html>​ 
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-(iv) “Lifelong smoker”: a smoker at all available data collections.<​html><​br></​html>​ 
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-In cases where data were missing from one or more waves, classification was based on the smoking status at the majority of data collections. Thus, if at three of four data collections the cohort member reported being a smoker, then they were classified as ‘predominantly smoker’.<​html><​br></​html>​ <​html><​br></​html>​ 
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-Key publications 
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-Clennell, S., Kuh, D.,​ Guralnik,​ j. M., Patel, K. V.,​  Mishra,​ G. D.,  Characterisation of smoking behaviour across the life course and its impact on decline in lung function and all-cause mortality: evidence from a British birth cohort. <​html><​a href="​http://​jech.bmj.com/​content/​62/​12/​1051.full.pdf"​ target="​_blank"></​html>​ J Epidemiol Community Health 2008;​62:​1051-1056<​html></​a></​html>​  <​html><​br></​html>​ 
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