Medical doctors use clinical statistics to evaluate their performances such as surgical procedures, medical therapeutics, stereoscopic interventions and so on. Professionals in public health use clinical statistics to reduce disease prevalence. Medical economists use clinical statistics to control medical costs or social costs of disease which include economic loss of patients' productivity. Politicians use clinical statistics to improve population health, and to reduce deeply distressed patients and their families, and improve medical service system. Clinical epidemiology has close relation to all these statics fields. In Chiba University our major concern is in political approach and health education to population.
Clinical statistics are presented by disease prevalence against population. If the composition of population changes, the effect of disease against population will change. Massive imｍigration and emigration dramatically affects disease compositions. According to population aging, the social impact of the disease will change. Therefore demography is very important for clinical epidemiology. The first step for students in our class is to understand demography.
The improvement of medicine and the intervention of politics affects on disease prevalence and population. In the ordinal estimation, even if the future of 50 years later, we use the same disease prevalence rate. We don't know what will happen in the future and it seems adequate to use the latest rates. To evaluate the effect of intervention, we need more precise estimation. We use trend analysis on the past ten-years-data. We analysed hospitalization rate from in 2000 to in 2013 and it has been decreasing about 1 % annually. Then we applied the hospitalization rate in 2013 to estimate from 2014 to 2017 with 1% regression. It was within less than 2% difference from actual data to estimation data.
Our blood pressure, pulse rate, and body weight are changing moment by moment. It is well known that twenty four hour blood pressure has much more importance than the blood pressure in the medical examination room. To collect daily life data, we have been providing PHR system named SHACHI. The superiority of SHACHI against other PHR is that we can share the data with EMR by integration system named SHACHI-Brain.