title: Reporting and statistically comparing averages of a patient cohort: the glass may really be half empty.
abstract: Nandakumar A, Clark NA, Peehal JP, et al. The increase in dural sac area is maintained at 2 years after X-stop implantation for the treatment of spinal stenosis with no significant alteration in lumbar spine range of movement. Spine J 2010:10:762-768 (in this issue).
authors.affiliation: Department of Orthopaedic Surgery, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02478, USA. bonocm@prodigy.net
authors.forename: Christopher M
authors.initials: CM
authors.lastname: Bono
mesh_terms: D015331:Cohort Studies; D003627:Data Interpretation, Statistical; D004388:Dura Mater / Q000000981:diagnostic imaging / Q000601:surgery; D006801:Humans; D016268:Internal Fixators; D011859:Radiography; D012107:Research Design; D013130:Spinal Stenosis / Q000000981:diagnostic imaging* / Q000601:surgery