Figure 2. Association of a history of cigarette smoking with change in FDG SUVRs, HpVR and EVR over time in MCI subjects. A history of cigarette smoking was associated with change in EVR, but not FDG SUVRs or HpVR. Abbreviations: FDG SUVRs: fluorodeoxyglucose standardized uptake values ratios; HpVR: Hippocampal volume ratio; EVR: Entorhinal cortex volume ratio.