Glossary for terms Glossary for Terms 781The terms used in the statistical tables in this book are summarized by chapter. The terms in this chapter are listed in the order of statistical tables. 1 Land and Climate Land area Districts surrounded by coastlines and the boundaries of municipalities, etc. in the Digital Japan Basic Map (Map Information) as of reference date. Coastlines on the Digital Japan Basic Map (Map Information) represent shorelines at high tide, whereas rivers, lakes and marshes are included in land areas. Land and sea boundaries of estuaries were identified by connecting the tips of both banks along the natural shapes of coastlines. Class A rivers Under the River Act, which came into force in 1965, water systems that are particularly important for national land conservation or the national economy and are designated by Cabinet Order are called "first-class water systems." Among the rivers related to first-class water systems, those that need to be managed under the River Act and are designated by the Minister of Land, Infrastructure, Transport and Tourism (limited to certain areas). 2 Population and Households Private household Defined as a group of persons sharing living quarters and living expenses, a person who lives by himself / herself in a dwelling unit, a person residing together with other persons but keeping a separate budget, a person residing in a boarding house, or a person who lives in a dormitory for unmarried employees of a company, corporation, store or government, etc. Institutional household (1) students in school dormitories, (2) inpatients of hospitals, (3) residents of social institutions, (4) persons in camps of Self-Defence Forces, (5) inmates of reformatory institutions, or (6) others (persons who have no fixed residence or crews who have no residence on land). Daytime population Refers to population which reduced the number of people commuting or attending school to other areas from the nighttime population in the area, and added those who commuting or attending school from other areas. Ratio of daytime population to nighttime population Refers to ratio of daytime population per 100 nighttime population. Foreign national residents Foreign nationals residing in Japan with the status of residence of Immigration Control and Refugee Recognition Act who are medium / long-term residents and special permanent residents. Infant mortality This refers to those that occurred within a year after birth. Foetal deaths This refers to the delivery of a dead child after twelve full weeks of gestation (or the fourth month of gestation), and a dead child is defined as a child whose heart pulsation, movement of voluntary muscles and respiration are not perceived after delivery. Standardised vital rates The value obtained by dividing the number of births (or deaths) in a given year by the population for that year is called the crude birth (or crude death) rate. When comparing the crude birth (or crude death) rates for different years, the structure of the population that serves as the denominator for calculating the rate differs depending on the year. For this reason, a standardised vital rates (standardised live birth rate and standardised death rate) for the Japanese population obtained via a standardising operation that excludes the effects of differences in the age structure and spousal relationship structure of the denominator population are calculated every year by the National Institute of Population and Social Security Research, taking the population in 1930 as the standard population. Standardised live birth rate When comparing birth rates for several populations, the age-specific birth rate of women is obtained for each population. Meanwhile, the population that should be the standard is determined, and the age-specific birth rate of women for each population is applied to that age-specific population in order to obtain the number of births expected to be produced by the standard population. The standardised birth rate is the calculated ratio of the expected number of births to the size of the standard population. Standardised death rate The standardised death rate is obtained by calculating the age-specific death rate by gender and applying it to the gender-specific age structure. Total fertility rate For the population in a certain year, the age-specific birth rates among women of reproductive age (from 15 to 49) are calculated and totaled. This index indicates the average number of children to be born to a woman assuming that she gives birth during her reproductive years, based on the calculated age-specific birth rates. Gross reproduction rate The total fertility rate includes both boys and girls, but the gross reproduction rate is a similar indicator for girls only. Net reproduction rate For girls born according to the gross reproduction rate, the death rate in each year is also considered in order to derive the number of girls who survive based on the stationary population in the life table and can be expected to become mothers to the next generation. Life expectancy (eox) With respect to the number of survivors at the age of x, lx, the average number of years that these individuals survive after the age of x is the life expectancy at the age of x, which is denoted by eox. Probability of dying (nqx) The probability that a person who has just reached the age of x will die before reaching the age of x + n is called the death rate between the ages of x and x + n, denoted by nqx. In particular, 1qx is called the death rate at the age of x, and this is denoted by qx. Number of survivors (lx) If we assume that a certain number of births in the life table, l0 (100,000 in the life table and the simplified life table), die according to the above death rate, the number of people expected to live to reach the age of x is called the survival rate at the age of x, and this is denoted by lx. Intra-prefectural migrants Refer to those persons who in changing their addresses moved across municipality boundaries within the same prefecture. Net-migration Net-migration was computed as the difference between in-migrants and out-migrants for each municipality (prefecture). In the statistical tables, "-" (minus sign) means that out-migration exceeds in-migration.
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