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Standardized mortality ratio
In epidemiology, the standardized mortality ratio or SMR, is a quantity, expressed as either a ratio or percentage quantifying the increase or decrease in mortality of a study cohort with respect to the general population.〔
==Standardized mortality ratio==
The standardized mortality ratio is the ratio of observed deaths in the study group to expected deaths in the general population.〔 This ratio can be expressed as a percentage simply by multiplying by 100.
The SMR may be quoted as either a ratio or a percentage. If the SMR is quoted as a ratio and is equal to 1.0, then this means the number of observed deaths equals that of expected cases. If higher than 1.0, then there is a higher number of deaths than is expected. SMR constitutes an indirect form of standardization. It has an advantage over the direct method of standardization since age-adjustment is permitted in situations where age stratification may not be available for the cohort being studied or where strata-specific data are subject to excessive random variability.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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