The author has mentioned in the second report of this series about the seasonal variation of the pieces of garments and the sensation of thermal condition of the environment. Present paper deals with the measurements of the seasonal variation of the weight and the thickness of garments in working conditions both outdoor and indoor. Also the relationship between the measured values and the thermal feelings was examined. The following results were obtained. At the temperature of 20°C which is most comfortable for human body, the average weight and pieces of garments for out door farm work were 2116.9 g and 11, 0 pieces, respectively, and those for outdoor regular garments were 1089.9 g and 7.6 pieces. As for the indoor garments, 1128.0 g and 4.5 pieces for working clothes and 1148.7 g and 8.1 pieces for regular clothes, respectively, were the average values. Wearing standards for thermal environment in the four seasons of Akita area of north-eastern Japan were established from the regression lines between the temperature and weight of garments for farm working and regular clothes, outdoor as well as indoor. Observed values of the garments which measured in the females who stated "comfortable" fell weithin the ranges of the above mentioned wearing standards.
To assess the significance of overweight, past or family history and drinking or smoking habits as the causal factors for development of hypertension, and to obtain any guiding principle in the control of hypertension, a survey of blood pressure was carried out on a community sample of men and women in Aira-town, Kagoshima prefecture during the year 1984. Total of 2291 persons were covered in this survey, comprising 1043 men and 1984 women aged 40 years and above. The followings are the main findings in this study. 1) Mean values of sytolic and diastolic blood pressure increased with advancing age for both sexes. The prevalence rate of hypertensives was also increased with advancing age for both sexes. In addition, the prevalence rate of hypertensives was significantly higher in men than in women when the comparison was made taking the age-composition into account. 2) When the subjects were classified into two groups, obese and non-obese groups according to the obese index calculated by Katsura's formula, the blood pressure level and the prevalence rate of hypertensives were higher in obese group than in non-obese group for both sexes. 3) Subjects who had a past history of hypertension or cerebral apoplexy had higher mean blood pressure value and substantially higher prevalence of hypertensives as compared with those who had not. 4) Subjects who's parents or siblings had a history of hypertension or cerebral apoplexy also showed higher value of blood pressure level and higher prevalence rate of hypertensives for both sexes. 5) No significant associations of drinking or smoking habits with blood pressure values were obtained after controlling for age and body build. 6) From the above, it was suggested that in this community, overweight might be a risk factor for development of hypertension and that maintenance of desirable body weight and moderate exercise should be recommended as the practical steps in the control of hypertension.
Environmental weather and dietary life exist within the same aspect throughout the Okinawa Prefecture. However on the farming population rates and the nature of drinking water there were regional differences. The correlations between above factors and the mortality from cerebro-vascular disease (CVD) were investigated. Interrelationships between CVD and several trace elements in drinking water were found to be strong and complex, especially water hardness and silicon seemed to make an important contribution to mortality from CVD. The mortality from CVD indicated the highest negative correlation coefficient (r=-0.86) for drinking water hardness. In our research regions, silicon concentration in drinking water was lower levels (6-14 mg/l) in Japan and correlated negatively with the mortality from CVD (r=-0.76). On the correlation with mortality from CVD, silicon concentration is considered to have a threshold value, which is presumed to about 10 mg/l. The mortality from CVD and farming population rate showed positive correlation (r=0.75). The mortality rate and Ca2+/SO4-2 are represented as the negative correlation.
For the purpose of investigating the factor relating to the recent average life span (e0) in Japan, relationships between e0 and 22 indices concerning dwelling, economy, education and health preceding e0 for 5 years were studied by annual changes and geographical differences, and the following results were obtained. 1) In the time serial correlation coefficients between e0 and indices, those with waterworks extension rate (W-rate) and the number of cases visited by public health nurses in charge of consultation about adult disease (C-number) were positive and significant, and those with livelihood protection rate (L-rate) were negative and significant. 2) In the geographical correlation coefficients between e0 and indices, and those or partial correlation coefficients between annual changes of e0 and indices, only those with W-rate and L-rate were significant in common with 3 methods of calculations for men, so were C-number for women. 3) In the multiple regression analyses of the annual changes of e0 on indices by forward selection procedure, W-rate was selected as the first variable for men and Cnumber for women, and L-rate as the second for both sexes. Above results suggest that W-rate and L-rate relate to e0 for men and C-number and L-rate for women.