Four hundred and fourteen out of 2, 399 children were classified into delayed speech group at the time of group health exmination at the age of one-and-a-half years in Toda city in the last three years. In order to investigate the effects of way and method of birth and nursing to the language development, retrospective study was carried out using the records of the group health exmination. The results were as follows: 1) Children having suffered from heavy jaundice at neonatal period were found to be delayed in speech. 2) The older the father, children were found to be the more delayed in speech . 3) The lower the school education of father, children were found to be the more delayed in speech 4) The lower the school education of mother, children were found to be the more delayed in speech. 5) Children being shy of strangers at the age of 10 months were found to be delayed in speech. 6) Children being unable to crawl at the age of 10 months were found to be delayed in speech. 7) Children being unable to stand supporting by themself s on something at the age of 10 months were found to be delayed in speech.
The purpose of this study is to make clear a comprehensive relationship between serum cholinesterase activity and the dietary of foods. These figures are taken from 84 young healthy male student. The results of the survey were as follows: 1) There were statistically significant correlation between serum cholinesterase activity and energy intake (r=0.281, Y=1723 + 0.47X). 2) Factor analysis showed that high serum cholinesterase activity group was modern food habits.It is possible to conclude from the results that serum cholinesterase activity was affected by nutrient intake.
Life expectancy at birth increased from 52.0 years to 76.9 years, and total fertility rate declined from 4.51 to 1.75 during the period 1947-1982 in Japan. In order to analyze the effects of such rapid declines in mortality and fertility on the aging of population, which is defined as increase in proportion of population 65 & over, 4 series of population projections were carried out by means of standard cohort component method. In each case, initial population applied was that of 1947, but mortality and fertility were assumed to be either constant at the level of 1947 or follow the actual trends during 1947-1982. Conditions of mortality and fertility applied are shown below. Case A: Actual trends of mortality and fertility Case B: Actual trends of mortality and constant fertility Case C: Constant mortality and actual trend of fertility Case D: Constant mortality and fertility Population projections were extended up to the year of 2082, assuming the mortality and the fertility to be constant after 1982. In each case, changes in proportion of population 65 & over and period growth rates of population 65 & over together with total population were measured. Then the contributions of mortality or fertility decline per se and interaction of both on actual and projected trend of proportion of population 65 & over were calculated separately for every 5 years. Although the effect of fertility decline appeared to play the major role in aging of population in Japan, the effect of mortality decline appeared to be far greater than it used to be in most of the European countries. It should be noted that the rapiddecline in middle and old age mortality as was experienced in post-war japan, would affect considerably the potential of population aging.