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Year : 2018  |  Volume : 9  |  Issue : 1  |  Page : 14

Effect of secondhand smoking, determined by urinary cotinine level on bone health

1 Department of Family Medicine, Jeju National University Hospital, Jeju Self-governing Province; Department of Medicine, Graduate School of Jeju National University, Republic of Korea
2 Department of Family Medicine, Jeju National University Hospital, Jeju Self-governing Province; Department of Family Medicine, School of Medicine, Jeju National University, Republic of Korea

Correspondence Address:
Hyeon Ju Kim
Department of Family Medicine, Jeju National University Hospital, Jeju-si, Jeju Self-governing Province, 63241, Republic of Korea
Republic of Korea
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/ijpvm.IJPVM_280_16

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Background: We evaluated the relationship between secondhand smoke (SHS) inhalation, as verified by urinary cotinine levels, and bone health. Methods: We analyzed the nationwide, population-based, cross-sectional health survey. We included 1936 men aged 50 years or older who checked bone mineral density (BMD) from the Korean National Health and Nutrition Examination Survey (2008–2010). Current smokers assessed by urinary cotinine levels higher than 500 ng/mL were excluded (n = 616). Exposure to SHS was determined using a 50 ng/mL urinary cotinine threshold. Results: The estimated prevalence of SHS exposure in our cohort was 13.9%. After adjusting for age and body mass index (BMI), T-scores at total femur (P < 0.001), femoral neck (P < 0.001), and lumbar spine (P = 0.004) were lower in SHS exposure versus nonexposure groups. Impaired bone health (osteopenia or osteoporosis) at femoral neck or lumbar spine was evident in 61.7% and 48.6% of SHS exposure and nonexposure cases, respectively (P = 0.004). Moreover, after adjusting for age, BMI, and health habits, the odds ratio for impaired bone health in the SHS exposure group was 1.89 (95% confidence interval: 1.31–2.74). Conclusions: Our findings suggest that SHS exposure, determined by urinary cotinine levels, is negatively associated with BMD and is a leading cause of impaired bone health in Korean men.

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