[Serial epidemiological study of hypertension in Tianjin]

Prevalence rate of hypertension in Tianjin is one of the highest in China, so we had done a series of epidemiological study of hypertension in Tianjin. Tianjin is one of the biggest cities in China with 8 million population. Prevalence rate of hypertension (1985) is 9.24% borderline 2.94%, total 12.18%. Incidence rate (1984) 0.66% & 0.14% (borderline). Prevalence rate: male 8.3%, female 10.2%; urban area 10.7%, rural area 5.7%. It increased in recent 20 years. Mortality rate of cardio- & cerebro-vascular diseases in Tianjin is also one of the highest, in China. Hypertension is one of the risk factors of CHD in Tianjin. Prevalence rate of hypertension increases with age. It is higher in drinkers than non-drinkers, higher in smokers than non-smokers. It is higher in the overweight group and in the group with family history of hypertension. High Na intake is one of the risk factors, it seems synergistic with family history. B. P. is lower in summer. It negatively correlates with atmospheric temperature and humidity.