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Figure 2 Unadjusted serum soluble intracellular adhesion molecule-1 (sICAM-1) in relation to body mass index (BMI) in non-smokers. Serum sICAM-1 levels are plotted for non-smoking subjects grouped according to normal (18.5 to 24.9), overweight (25.0 to 29.9), or obese (30) BMI with the number of observations (N) given in each group. The relationship between sICAM-1 levels and BMI did not vary significantly by gender or smoking status and was significant by gender- and age-adjusted multivariable linear regression (p < 0.001).