Influence of fracture criteria on the outcome of a randomized trial of therapy |
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Authors: | L J Melton K S Egan W M O’Fallon B L Riggs |
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Affiliation: | (1) Department of Endocrinology and Internal Medicine, Mayo Clinic and Mayo Foundation, Rochester, Minnesota, USA;(2) Department of Health Sciences Research, Mayo Clinic, 200 First Street SW, 55905 Rochester, MN, USA |
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Abstract: | Based on a presumption that the morphometric approach to vertebral fracture assessment is beset by false positive deformities,
it has been suggested that more stringent criteria should be used to assess vertebral fracture outcomes in clinical trials
of osteoporosis therapies. We applied a variety of criteria in the reanalysis of a randomized trial of sodium fluoride therapy
for women with established osteoporosis. Although progressively more severe criteria reduced the cumulative incidence of a
new vertebral fracture in both those receiving a placebo and the fluoride-treated patients, differences between the two groups
were not magnified and none of the suggested approaches produced a statistically significant result. These findings indicate
that the false positive rate associated with morphometric assessment of vertebral fractures is not so great as supposed from
theoretical considerations that assume independence among the measurements. Our findings also provide some reassurance that
differences in the criteria used to define a vertebral fracture are not the controlling influence in the likelihood that a
particular clinical trial will find a result favoring one treatment over another. |
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Keywords: | Diagnostic criteria Incidence Randomized clinical trial Vertebral fracture |
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