Figure 1From: An indoor air filtration study in homes of elderly: cardiovascular and respiratory effects of exposure to particulate matter Percent change with 95% confidence interval in microvascular function corresponding to a 10 μg/m 3 decrease in PM 2.5 in the bedroom and living room after 2, 7 and 14 days of active filtration and all 3 days combined, estimated by mixed-effects models adjusted for baseline level, BMI, age and gender. Back to article page