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Unadjusted cumulative incidence Kaplan-Meier curves for categories of the ΔHR in the SHHS (Sleep Heart Health Study). Only one study site followed participant and provided mortality data after Year 13 (no CVD death reported from this study during this period). CVD = cardiovascular disease; ΔHR = pulse-rate response to apneas/hypopneas; Mid = midrange.
