Sarraf Zadegan, N. Boshtam, M. Mostafavi, S. Rafiei, M. 1999 A population based cross sectional survey was conducted to determine the mean levels of blood pressure and prevalence rates of hypertension and to identify differences in the prevalence of other risk factors in hypertensive and nonhypertensive people. A total of 8624 men and women or 19 years were randomly selected. Overall, 18.0 16.8 males and 19.4 females had systemic hypertension. The mean levels of systolic and diastolic blood pressure and the prevalence of hypertension increased with age, but no significant differences were found ...