Exposure to secondhand smoke and cognitive impairment in non-smokers: national cross sectional study with cotinine measurement

Llewellyn, David J, Lang, Iain A, Langa, Kenneth M, Naughton, Felix and Matthews, Fiona E (2009) Exposure to secondhand smoke and cognitive impairment in non-smokers: national cross sectional study with cotinine measurement. BMJ, 338. ISSN 1759-2151

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Objective: To examine the association between a biomarker of exposure to secondhand smoke (salivary cotinine concentration) and cognitive impairment.  Design: Cross sectional analysis of a national population based study.  Setting: Stratified random sample of households throughout England.  Participants: 4809 non-smoking adults aged 50 years or more from the 1998, 1999, and 2001 waves of the Health Survey for England who also participated in the 2002 wave of the English Longitudinal Study of Ageing and provided saliva samples for cotinine assay and a detailed smoking history.  Main outcome measure: Cognitive impairment as defined by the lowest 10% of scores on a battery of neuropsychological tests.  Results: Participants who did not smoke, use nicotine products, or have salivary cotinine concentrations of 14.1 ng/ml or more were divided into four equal size groups on the basis of cotinine concentrations. Compared with the lowest fourth of cotinine concentration (0.0-0.1 ng/ml) the odds ratios (95% confidence intervals) for cognitive impairment in the second (0.2-0.3 ng/ml), third (0.4-0.7 ng/ml), and highest fourths (0.8-13.5 ng/ml) were 1.08 (0.78 to 1.48), 1.13 (0.81 to 1.56), and 1.44 (1.07 to 1.94; P for trend 0.02), after adjustment for a wide range of established risk factors for cognitive impairment. A similar pattern of associations was observed for never smokers and former smokers.  Conclusions:  Exposure to secondhand smoke may be associated with increased odds of cognitive impairment. Prospective nationally representative studies relating biomarkers of exposure to cognitive decline and risk of dementia are needed.

Item Type: Article
Uncontrolled Keywords: aged,80 and over,biomarkers,cognition disorders,cotinine,cross-sectional studies,female,humans,longitudinal studies,male,regression analysis,saliva,tobacco smoke pollution
Faculty \ School: Faculty of Medicine and Health Sciences > School of Health Sciences
UEA Research Groups: Faculty of Medicine and Health Sciences > Research Groups > Health Promotion
Faculty of Medicine and Health Sciences > Research Centres > Lifespan Health
Depositing User: Pure Connector
Date Deposited: 06 Jan 2017 00:03
Last Modified: 04 Nov 2023 03:21
URI: https://ueaeprints.uea.ac.uk/id/eprint/61945
DOI: 10.1136/bmj.b462

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