On the same person, the treatment of blood pressure has made the change by the hour of the day (blood pressure treatment usually have a high tendency in the morning and night low), according to the response of the body such as sleep, when there is stress, after fed. .. In addition blood pressure also varies by gender, race, age (blood pressure may rise 5 mmHg for every 10 years, while blood pressure did not change). Difficult standards for individual (fit of ethnic, gender, ages, societies they are living), so the concept of treatment of normal and high blood pressure are approved based on statistics [2].
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