Abbreviations:BMI (body mass index), CI (confidence interval), DVT (deep vein thrombosis), HMO (health maintenance organization), HRT (hormone replacement therapy), ICD-9 (International Classification of Diseases, ninth revision), OCP (oral contraceptive pill), OR (odds ratio), PE (pulmonary embolism), VTE (venous thromboembolism)
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This study was supported by a grant from Kaiser Permanente Northwest Community Benefit Investment. The Kaiser Permanente Northwest Community Benefit Investment supports collaboration between clinical investigators from Northwest Permanente Medical Group and the Center for Health Research.
Dr. DeLoughery receives grant support or honoraria from GlaxoSmithKline, Aventis, and Baxter. The other authors have no conflicts of interest to disclose.
Reproduction of this article is prohibited without written permission from the American College of Chest Physicians (www.chestjournal.org/misc/reprints.shtml).