title: Prediction of low bone mineral density in patients with inflammatory bowel diseases.
abstract: BACKGROUND
  Low bone mineral density (BMD) remains a frequent problem in patients with inflammatory bowel diseases (IBD). There is no general agreement regarding osteoporosis screening in IBD patients.
  
  
  METHODS
  Cases of low BMD and disease characteristics were retrieved from 3172 patients of the Swiss IBD cohort study. Multivariate logistic regression analysis was conducted for predictive modeling. In a subgroup of 877 patients, 253 dual-energy X-ray absorptiometry (DXA) scans were available for validation.
  
  
  RESULTS
  Low BMD was prevalent in 19% of patients. We identified seven predictive factors: type of IBD, age, recent steroid usage, low body mass index, perianal disease, recent high disease activity and malabsorption syndrome. Low BMD could be predicted with a sensitivity of 79% and a specificity of 64%, a positive predictive value (PPV) of 35% and a negative predictive value (NPV) of 93%. The area under the curve of the receiver operating characteristics was 0.78. In the validation cohort we calculated a PPV of 26% and an NPV of 88%.
  
  
  CONCLUSIONS
  We provide a comprehensive analysis of risk factors for low BMD and propose a predictive model with seven clinical variables. The high NPV of models such as ours might help in excluding low BMD to prevent futile investigations.
authors.affiliation: Division of Gastroenterology and Hepatology, University Hospital Zurich and Zurich University, Switzerland.
authors.forename: Solvey
authors.initials: S
authors.lastname: Schüle
authors.affiliation: Institut de Médecine Sociale et Préventive Unité d'Evaluation des Soins Bio2/02/185, Switzerland.
authors.forename: Jean-Benoît
authors.initials: JB
authors.lastname: Rossel
authors.affiliation: Division of Rheumatology, University Hospital Zurich and Zurich University, Switzerland.
authors.forename: Diana
authors.initials: D
authors.lastname: Frey
authors.affiliation: Division of Gastroenterology and Hepatology, University Hospital Zurich and Zurich University, Switzerland.
authors.forename: Luc
authors.initials: L
authors.lastname: Biedermann
authors.affiliation: Division of Gastroenterology and Hepatology, University Hospital Zurich and Zurich University, Switzerland.
authors.forename: Michael
authors.initials: M
authors.lastname: Scharl
authors.affiliation: Division of Gastroenterology and Hepatology, University Hospital Zurich and Zurich University, Switzerland.
authors.forename: Jonas
authors.initials: J
authors.lastname: Zeitz
authors.affiliation: Division of Gastroenterology and Hepatology, University Hospital Zurich and Zurich University, Switzerland.
authors.forename: Natália
authors.initials: N
authors.lastname: Freitas-Queiroz
authors.affiliation: Institut de Médecine Sociale et Préventive Unité d'Evaluation des Soins Bio2/02/185, Switzerland.
authors.forename: Valérie
authors.initials: V
authors.lastname: Pittet
authors.affiliation: Division of Gastroenterology and Hepatology, University Hospital Zurich and Zurich University, Switzerland; Department of Medicine, Division of Gastroenterology, Triemli Hospital, Zurich, Switzerland.
authors.forename: Stephan R
authors.initials: SR
authors.lastname: Vavricka
authors.affiliation: Division of Gastroenterology and Hepatology, University Hospital Zurich and Zurich University, Switzerland.
authors.forename: Gerhard
authors.initials: G
authors.lastname: Rogler
authors.affiliation: Division of Gastroenterology and Hepatology, University Hospital Zurich and Zurich University, Switzerland.
authors.forename: Benjamin
authors.initials: B
authors.lastname: Misselwitz
keywords: Osteoporosis; bone mineral density; inflammatory bowel diseases; predictive model