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(A, B) Unfair comparison between the two groups due to differences in the exposure levels to risk. Patients with multiple vertebral compression fractures have more than two adjacent levels as a conservative estimate. All of these adjacent levels (arrowheads in 4B) may be involved in new fracture cases in the development of subsequent new fractures; despite the presence of three adjacent levels (arrows in 4A), only one intervening body may be involved in the sandwiching group.
