Association between glaucomatous optic neuropathy and variability of mean arterial pressure. The risk was expressed per 1 SD on VIM (2 mmHg). Models were unadjusted (a), adjusted for a propensity score derived from age, educational attainment, serum high-density lipoprotein cholesterol, and in-office hypertension (b), and a propensity score additionally accounting for blood pressure level (c). Nc number of cases, Nr number of participants with healthy eyes, OR odds ratio, CI confidence interval, GON glaucomatous optic neuropathy, VFD visual field defects, VIM variation of mean arterial pressure independent of its mean level, MAP mean arterial pressure