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Mortality rate, or death rate, is a measure of the number of deaths (in general, or due to a specific cause) in a particular population, scaled to the size of that population, per unit of time. Mortality rate is typically expressed in units of deaths per 1,000 individuals per year; thus, a mortality rate of 9.5 (out of 1,000) in a population of 1,000 would mean 9.5 deaths per year in that entire population, or 0.95% out of the total. It is distinct from the so-called "morbidity rate" (a vague term sometimes used to refer to either the prevalence or incidence of a disease), and also from the incidence rate (the number of newly appearing cases of the disease per unit of time). == Related measures of mortality == Other specific measures of mortality include: * Crude death rate – the total number of deaths per year per 1,000 people. the crude death rate for the whole world is 7.89 per 1,000 (down from 8.37 per 1,000 in 2009) according to the current CIA World Factbook.〔() Search for "World".〕 Note that the crude death rate can be misleading. The crude death rate depends on the age (and gender) specific mortality rates and the age (and gender) distribution of the population. The number of deaths per 1,000 people can be higher in developed nations than in less-developed countries, despite a higher life expectancy in developed countries due to better standards of health. This happens because developed countries typically have a much higher proportion of older people, due to both lower birth rates and lower mortality rates. A more complete picture of mortality is given by a life table, which shows the mortality rate separately for each age. A life table is necessary to give a good estimate of life expectancy. * Perinatal mortality rate – the sum of neonatal deaths and fetal deaths (stillbirths) per 1,000 births. * Maternal mortality ratio – the number of maternal deaths per 100,000 live births in same time period. * Maternal mortality rate – the number of maternal deaths per 1,000 women of reproductive age in the population (generally defined as 15–44 years of age). * Infant mortality rate – the number of deaths of children less than 1 year old per 1,000 live births. * Child mortality rate: the number of deaths of children less than 5 years old per 1,000 live births. * Standardised mortality ratio (SMR) – a proportional comparison to the numbers of deaths that would have been expected if the population had been of a standard composition in terms of age, gender, etc.〔Everitt, B.S. ''The Cambridge Dictionary of Statistics'', CUP. ISBN 0-521-81099-X〕 * Age-specific mortality rate (ASMR) – the total number of deaths per year per 1,000 people of a given age (e.g. age 62 last birthday). * Cause-specific mortality rate – the mortality rate for a specified cause of death. * Cumulative death rate: a measure of the (growing) proportion of a group that die over a specified period (often as estimated by techniques that account for missing data by statistical censoring). * Case fatality rate (CFR) – the proportion of cases of a particular medical condition that lead to death within a specified period of time. Other measures of mortality used to provide indications of the relative success or failure of medical treatment or procedures (for life-threatening illnesses, etc.) include: * Early mortality rate – the total number of deaths in the early stages of an ongoing treatment, or in the period immediately following an acute treatment. * Late mortality rate – the total number of deaths in the late stages of an ongoing treatment, or a significant length of time after an acute treatment. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「mortality rate」の詳細全文を読む スポンサード リンク
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