title: Risk factors associated with incident clinical vertebral and nonvertebral fractures in postmenopausal women: the Canadian Multicentre Osteoporosis Study (CaMos).
abstract: Utilizing data from the Canadian Multicentre Osteoporosis Study (CaMos), we examined the association between potential risk factors and incident vertebral and nonvertebral fractures. A total of 5,143 postmenopausal women were enrolled. Information collected during the study included data from the CaMos baseline and annually mailed fracture questionnaires, the Short Form 36 (SF-36), the Health Utilities Index, and physical measurements. Participants were followed for 3 years. Postmenopausal women were classified into four groups according to their incident fracture status since baseline: those without a new fracture; those with a new clinically recognized vertebral fracture; those with an incident nonvertebral fracture at the wrist, hip, humerus, pelvis, or ribs (main nonvertebral fracture group); and those with any new nonvertebral fracture (any-nonvertebral-fracture group). We performed multivariate Cox proportional hazard analysis using all possible risk factors to determine the association between risk factors and the time to the first minimal trauma fracture. Best predictive models were also determined using variables that were included in the full models. The Bayesian information criterion was used for model selection. For all analyses, relative risks and associated 95% confidence intervals were calculated. During the follow-up period, 34, 163, and 280 women developed a vertebral, a main nonvertebral, or any nonvertebral fracture, respectively. The best predictive models indicated that a five point lower quality of life as measured by the SF-36 physical component summary score was associated with relative risks of 1.21 (95% CI, 1.02 to 1.44), 1.17 (95% CI, 1.07 to 1.28), and 1.19 (95% CI, 1.11 to 1.27) for incident vertebral, main nonvertebral, and all nonvertebral fractures, respectively. In addition, for a one standard deviation (SD=0.12) lower femoral neck BMD, the relative risks for incident vertebral, main nonvertebral, and any nonvertebral fractures increased by 2.73 (95% CI, 1.74 to 4.28), 1.39 (95% CI, 1.06 to 1.82), and 1.34 (95% CI, 1.09 to 1.65), respectively. Furthermore, various anthropometric measures, disease conditions, and medications are associated with a new fracture. Identifying postmenopausal women at risk is important given that fracture prevention therapies are now available.
authors.affiliation: Department of Medicine, St. Joseph's Hospital, McMaster University, Hamilton, Ontario, Canada.
authors.forename: Alexandra
authors.initials: A
authors.lastname: Papaioannou
authors.forename: Lawrence
authors.initials: L
authors.lastname: Joseph
authors.forename: George
authors.initials: G
authors.lastname: Ioannidis
authors.forename: Claudie
authors.initials: C
authors.lastname: Berger
authors.forename: Tassos
authors.initials: T
authors.lastname: Anastassiades
authors.forename: Jacques P
authors.initials: JP
authors.lastname: Brown
authors.forename: David A
authors.initials: DA
authors.lastname: Hanley
authors.forename: Wilma
authors.initials: W
authors.lastname: Hopman
authors.forename: Robert G
authors.initials: RG
authors.lastname: Josse
authors.forename: Susan
authors.initials: S
authors.lastname: Kirkland
authors.forename: Timothy M
authors.initials: TM
authors.lastname: Murray
authors.forename: Wojciech P
authors.initials: WP
authors.lastname: Olszynski
authors.forename: Laura
authors.initials: L
authors.lastname: Pickard
authors.forename: Jerilynn C
authors.initials: JC
authors.lastname: Prior
authors.forename: Kerry
authors.initials: K
authors.lastname: Siminoski
authors.forename: Jonathan D
authors.initials: JD
authors.lastname: Adachi
mesh_terms: D000328:Adult; D017677:Age Distribution; D000368:Aged; D000886:Anthropometry; D015519:Bone Density; D005260:Female; D050723:Fractures, Bone / Q000209:etiology* / Q000503:physiopathology; D006801:Humans; D008019:Life Style; D008875:Middle Aged; D015663:Osteoporosis, Postmenopausal / Q000150:complications* / Q000503:physiopathology; D016016:Proportional Hazards Models; D011446:Prospective Studies; D011788:Quality of Life; D012307:Risk Factors; D016103:Spinal Fractures / Q000209:etiology / Q000503:physiopathology