Fig 3. Relationship between the blood pressure parameters [SBP (A), DBP (B), MABP (C) and HBP (D)] and cognitive impairment in the age-based subgroups after correcting for confounds (model 5).

First, we divided the population into 4 age-based subgroups (40–49, 50–59, 60–69, and ≥70 years) and established a model (model 5) for every blood pressure parameter in every subgroup. The confounding variables considered in model 5 were the same as those considered in model 2. However, model 2 was developed using the data from the entire population, whereas model 5 was developed using the data from the age-based subgroups.