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Fig. 1 | BMC Geriatrics

Fig. 1

From: Association between cervical artery dissection and spinal manipulative therapy –a medicare claims analysis

Fig. 1

Definition of Cases and Controls. The design of the study consists of three case-controls drawn from Medicare beneficiaries between 2007 and 2015. It studies VAD and CAD cases and compares each to (i) age-sex-year matched Medicare beneficiaries (10:1), (ii) Ischemic stroke controls and self-controls (cases 6 months before their incident artery dissection). The numbers of each case and control are shown.

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