Study Results from Tohoku University School of Public Health in the Area of Dementia Reported (Smoking cessation and incident dementia in elderly Japanese: the Ohsaki Cohort 2006 Study)

2020 FEB 26 (NewsRx) -- By a News Reporter-Staff News Editor at Disease Prevention Daily -- Investigators publish new report on Neurodegenerative Diseases and Conditions - Dementia. According to news reporting originating from Miyagi, Japan, by NewsRx correspondents, research stated, “To investigate the association of smoking status and years since smoking cessation with the risk of incident dementia among elderly Japanese. We conducted a longitudinal analysis of smoking status and smoking cessation with dementia in prospective cohort study of 12,489 Japanese individuals aged 65 years who were followed up for 5.7 years.”

Our news editors obtained a quote from the research from the Tohoku University School of Public Health, “Information on smoking status and other lifestyle factors was collected via a questionnaire in 2006. Data on incident dementia were retrieved from the public Long-term Care Insurance Database. The Cox proportional hazards model was used to estimate the multivariable-adjusted hazard ratios (HRs) and 95% confidence intervals (95% CIs) for incident dementia. During 61,613 person-years of follow-up, 1110 cases (8.9%) of incident dementia were documented. Compared with individuals who had never smoked, current smokers showed a higher risk of dementia (HR 1.46, 95% CI 1.17, 1.80). Among ex-smokers, the risk for those who had stopped smoking for 2 years was still high (HR 1.39, 95% CI 0.96, 2.01), however, quitting smoking for 3 years or longer mitigated the increased risk incurred by smokers; the multivariable HRs (95% CIs) were 1.03 (0.70, 1.53) for those who had stopped smoking for 3-5 years, 1.04 (0.74, 1.45) for 6-10 years, 1.19 (0.84, 1.69) for 11-15 years, and 0.92 (0.73, 1.15) for >15 years.”

According to the news editors, the research concluded: “Our study suggests that the risk of incident dementia among ex-smokers becomes the same level as that of never smokers if they maintain abstinence from smoking for at least 3 years.”

For more information on this research see: Smoking cessation and incident dementia in elderly Japanese: the Ohsaki Cohort 2006 Study. European Journal of Epidemiology, 2020;():. European Journal of Epidemiology can be contacted at: Springer, 233 Spring Street, New York, NY 10013, USA. (Springer - www.springer.com; European Journal of Epidemiology - http://www.springerlink.com/content/0393-2990/)

The news editors report that additional information may be obtained by contacting Y. Lu, Division of Epidemiology, Dept. of Health Informatics and Public Health, Tohoku University School of Public Health, Graduate School of Medicine, 2-1 Seiryo-machi, Aoba-ku, Sendai, Miyagi, 980-8575, Japan. Additional authors for this research include Y. Sugawara, S. Zhang, Y. Tomata and I. Tsuji.

The direct object identifier (DOI) for that additional information is: https://doi.org/10.1007/s10654-020-00612-9. This DOI is a link to an online electronic document that is either free or for purchase, and can be your direct source for a journal article and its citation.

Publisher contact information for the European Journal of Epidemiology is: Springer, 233 Spring Street, New York, NY 10013, USA.

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