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Hazard ratios for mortality from combined EDS and SDB at various levels of SDB (as defined by the apnea-hypopnea index, [AHI, events/h]). The reference category is an AHI < 5 events/h. Bars represent 95% confidence intervals. Dark gray columns indicate unadjusted analyses. Light gray columns indicate adjusted analyses that include covariates from the final model shown in Table 2.
