Waist Circumference and Body Mass Index as Predictors of Elevated Blood Pressure in Schoolchildren.
Background: Childhood blood pressure tracks into adulthood meaning early identification of this modifiable cardiovascular risk factor may be important in combating cardiovascular disease.
Objectives: To evaluate the association of waist circumference (WC) and body mass index (BMI) with systolic (SBP) and diastolic blood pressure (DBP) in English schoolchildren.
Methods: A cross-sectional study of 7201 (48% female) schoolchildren (9 -16 years). SBP and DBP were measured and deemed elevated if they exceeded the 91st percentile for age and sex. Binary logistic regression was conducted to see if elevated SBP and DBP can be predicted from WC and BMI categorised as normal-weight overweight or obese. Generalised Linear Model was used to compare the contribution of WC and BMI on blood pressure.
Results : Compared with a normal WC, participants’ SBP was more likely to be elevated if their WC was classified as overweight (OR, 1.43; 95%CI, 1.19-1.75) or obese (OR, 2.35; 95%CI, 2.05-2.69). The same was true if BMI was categorised as overweight (OR, 1.99; 95%CI, 1.74-2.29) or obese (OR, 3.53; 95%CI, 2.87-4.34). DBP was more likely to be elevated in pupils whose WC was classified as overweight (OR, 1.20; 95%CI, 1.03-1.40) or obese (OR, 2.09; 95%CI, 1.85-2.35) compared with normal-weight pupils. Similarly DBP was likely to be elevated in pupils with BMI categorised as overweight (OR, 1.70; 95%CI, 1.51-1.91) or obese (OR, 2.93; 95%CI, 2.39-3.59). In multivariate model, WC accounted for more SBP and DBP than BMI did.
Conclusions: Higher WC and BMI both predict elevated blood pressure in schoolchildren, but WC was a more important predictor of Systolic blood pressure than BMI.
Available at: http://works.bepress.com/aogun/3/