title: [Optimal cut-off value of phalangeal radiographic absorptiometry to identify osteoporosis in postmenopausal women].
abstract: OBJECTIVE
  To study the optimal cut-off value of phalangeal radiographic absorptiometry (RA) to identify osteoporosis in postmenopausal women.
  
  
  METHODS
  A total of 650 postmenopausal women were recruited in this study. Bone mineral density (BMD) at lumbar spine and left proximal femur neck was measured by dual-energy X-ray absorptiometry (DXA) as the standard method to identify postmenopausal osteoprosis. Phalangeal bone density was estimated by the use of RA. Optimal cut-off value of phalangeal RA was determined using a ROC curve for screening the ostreoporosis cases.
  
  
  RESULTS
  When the cut-off value of phalangeal RA was T score < or = -2.5, the sensitivity was 74.2%, the specificity was 72.9%. When the cut-off value was T score < or = -2.21, the sensitivity was 81.4%, the specificity was 62.0%.
  
  
  CONCLUSIONS
  The cut-off value of phalangeal RA as T score -2.21. which has higher sensitivity could be optimal to identify postmenopausal osteoporosis.
authors.forename: Ting
authors.initials: T
authors.lastname: Liu
authors.forename: Chun-yan
authors.initials: CY
authors.lastname: Lu
authors.forename: Yan-hong
authors.initials: YH
authors.lastname: Guo
authors.forename: Qin
authors.initials: Q
authors.lastname: Wang
authors.forename: De-cai
authors.initials: DC
authors.lastname: Chen
mesh_terms: D015502:Absorptiometry, Photon; D015519:Bone Density; D005260:Female; D050278:Finger Phalanges / Q000473:pathology*; D006621:Hip Joint; D006801:Humans; D008159:Lumbar Vertebrae; D015663:Osteoporosis, Postmenopausal / Q000175:diagnosis*; D012372:ROC Curve; D012016:Reference Values; D012680:Sensitivity and Specificity