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Blood pressure distribution among school children living in high pollution area vs a less polluted area. Normal blood pressure (systolic <120 mmHg and diastolic <80 mmHg) and prehypertension (systolic 120–139 mmHg or diastolic 80–89 mmHg) are defined according to VII Joint National Committee on Prevention, Detection, Evaluation, and Treatment of High Blood Pressure [20], (p=0.03).
