title: Smoking among premenopausal women is associated with increased risk of low bone status: the JPOS Study.
abstract: The impact of smoking on peak bone density has not been conclusively established. We examined how smoking exposure influences bone mineral density (BMD) or the risk of low bone status in premenopausal women. We conducted a baseline survey with a representative sample of Japanese women in 1996. The effect of current and former smokers (ever-smoker) was investigated with 789 premenopausal women aged 20-40 years. The multiple regression with stepwise method was used to identify significant determinants for BMD or the risk of low bone status (T-score < -1) with age, height, weight, calcium intake, coffee consumption, exercise habits, level of daily activity, parity >or= 1, and smoking as explanatory variables. The smoking effect was determined after adjusting for age, height, weight, and significant variables in the multiple regression with stepwise method. Ever-smoker was significantly associated with decreased lumbar BMD adjusted for age, height, and weight. The odds ratio of an ever-smoker for low bone status at the lumbar spine was 2.03 (95% CI 1.12, 5.82) adjusted for age, height, weight, and parity. The odds ratio for low bone status at the lumbar spine was 1.59 (95% CI 0.65, 3.91) and 2.55 (95% CI 1.12, 5.82) in those with less than 3 pack-years of tobacco use and in those with 3 or more pack-years of tobacco use, respectively. These values were adjusted for age, height, weight, and parity using a never-smoker as a reference. Cumulative smoking exposure may be associated with increased risk of low bone status among premenopausal women.
authors.affiliation: Department of Public Health, Kinki University School of Medicine, Osaka-Sayama, Osaka, Japan.
authors.forename: Junko
authors.initials: J
authors.lastname: Tamaki
authors.forename: Masayuki
authors.initials: M
authors.lastname: Iki
authors.forename: Yuho
authors.initials: Y
authors.lastname: Sato
authors.forename: Etsuko
authors.initials: E
authors.lastname: Kajita
authors.forename: Sadanobu
authors.initials: S
authors.lastname: Kagamimori
authors.forename: Yoshiko
authors.initials: Y
authors.lastname: Kagawa
authors.forename: Hideo
authors.initials: H
authors.lastname: Yoneshima
mesh_terms: D015502:Absorptiometry, Photon; D000328:Adult; D015992:Body Mass Index; D015519:Bone Density / Q000502:physiology*; D002136:Calcium, Dietary / Q000008:administration & dosage; D003430:Cross-Sectional Studies; D005260:Female; D006306:Health Surveys; D006801:Humans; D007564:Japan; D008159:Lumbar Vertebrae / Q000737:chemistry; D015663:Osteoporosis, Postmenopausal / Q000517:prevention & control; D017697:Premenopause / Q000502:physiology; D012307:Risk Factors; D012907:Smoking / Q000009:adverse effects*; D013223:Statistics as Topic; D011795:Surveys and Questionnaires; D055815:Young Adult
chemical_list: D002136:Calcium, Dietary