Adjusted hazard ratios (95% confidence intervals) for the association between quartiles of arousal frequency and all-cause mortality in the Sleep Heart Health Study.

aModel 1: Adjusted for age (continuous) and race.
bModel 2: Adjusted for covariates of model 1 and body mass index (continuous).
cModel 3: Adjusted for covariates of model 2 and smoking status (never, former, current), hypertension, diabetes, and cardiovascular disease.
dSex was included as a covariate in each of the three models based on all participants.