Analysis was made of differences in health levels (using crude mortality rate, infant mortality rate and birth rate) among the districts divided by the economic zones which had been provided by the Japanese Ministry of Agriculture and Forestry. The results may be summarized as follows: 1. It was revealed that health levels in the districts by the economic zone were lower in the decreasing sequence of the suburban district, the plain farming villages, the farming mountain villages and the mountain villages. In other words, the crude mortality rate and the infant mortality rate were commonly lowest in the suburban district, and higher in the increasing sequence of the plain farming villages, the farming mountain villages and the mountain villages. The birth rate was lower in the same but decreasing sequence. 2. When health levels in 36 districts made up by combining the agricultural zone with the economic zone were analyzed, health level was commonly low in the Hokuriku, the Shikoku and the Kyushu district. It was highest in the Tokai, the Kanto and the Tosan district, and it was relatively high in the Hokkaido district, too. When correlations between the mortality rate and the infant mortality rate in these 36 districts were analyzed, the 36 districts were divided by health level into three groups. 3. Health level by the regional type was highest in the industrial district, and low in the remote district. Especially there was a distinet difference in the infant mortality rate between the two districts. The morality rates and the infant mortality rates in the farming mountain villages and mountain villages in the industrial district were higher than those in the suburban district. Correlations between crude mortality rates and infant mortality rates in the 31 districts, excluding the districts where health level was extremely low, were analyzed: a correlation coefficient of r= +0.842, and a regression line of y=0. 347x + 1.102were obtained. This regression line implies the theoretical statuses of health level by the regional type and the economic zone. 4. The differences in health level among the districts by the economic zone were more distinct than those by the urban and rural district. Especially the evaluation of the level by the economic zone was suitable for the mountain villages included in the rural district. In other words, the evaluation of health levels in the districts by the economic zone suggests a new direction of health service in farming villages. 5. It was disclosed that the infant mortality rate would be superior to the crude mortality rate as an index to health level. 6. Health level was commonly lower in many islands than that in farming mountain villages.
For revealing the practical state and the epidemiological picture of influenza B, which invaded and infected in Japan from April 1973 to the early stage of 1974, it was studied seroepidemiologically and the following results were obtained. 1. B/Yamagata/1/73 strain which was isolated and identified in the present infection had some antigen common to typical B type strain which had been isolated in the past. 2. The HI antibody against B/Yamagata/1/73 strain observed in the sera of adults before the infection, but was not found in the sera of persons younger than high-school students. 3. The HI antibody increased to about 32 to 256-folds after the infection by B/Yamagata/1/73 strain. 4. After the infection by B/Yamagata/1/73 strain, the HI antibodies against B/Tokyo/7/66 strain and B/Kanagawa/1/73 strain were found to increase considerably. 5. Among the subject who had the HI antibody values against B/Yamagata/1/73 strain more than 32-folds in the sera after the infection, about 87% had CF(S) antibody, 6. By reducing slightly the amount of the attacking virus from a usually used one, a neutralizing antibody against B/Yamagata/1/73 strain was detected from the sera having high HI antibody against B/Tokyo/7/66 strain, though the HI antibody value against B/Yamagata/1/73 strain was less than 16-folds. 7. The number of the patients were greatly varied among the school and the classes attacked by the infection of B/Yamagata/1/73 strain. The difference of the patient numbers seemed to have some reaction to the HI antibody and the neutralizing antibody against B/Tokye/7/66 strain and B/Kanagawa/1/73 strain which were found to have some common antigen to B/Yamagata/1/73, and to their degrees in the sera before the infection.
A survey on the prevalence of anaemia and its follow-up with haematological examination were carried out for students of a certain women's college in Tokyo from 1964 to 1968. In addition to blood examination (haemoglobin content and specific gravity of blood), there was studied by inquiry method to reveal the relationships between levels of haemoglobin with variance and some factors in daily school-life. 1) Studies on the haemoglobin contents of 1883 subjects in 1968 gave the following results: Mean=12.4g/dl Standard Deviation=0.978/dl 2) Comparison of distributions of haemoglobin contents with variances among year class groups did not show marked difference statistically. 3) Comparison of prevalences between the groups, divided into two groups by the elapsed time since the age at menarche, showed the significant difference as follows: Prevalence of the cases with levels of haemoglobin lower than 10.5g/dl in case of group, elapsed less than 7 years from menarche, was 3.5%. And in case of group, elapsed more than 7 years, was 1.8%. 4) The larger variance was seen in the distribution of haemoglobin contents obtained from the follow-up examination for cases which levels of haemoglobin gained lower than 11.0g/ dl at the screening examination carried out 2 months before. There must be further investigation regarding the interval of the panel of the examination in order to get more information about the change of haemoglobin level.