Standardized mortality ratio

The standardized mortality ratio or SMR in epidemiology is the ratio of observed deaths to expected deaths, where expected deaths are calculated for a typical area with the same age and gender mix by looking at the death rates for different ages and genders in the larger population.

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.

An example might be a cohort study into cumulative exposure to arsenic from drinking water, whereby the mortality rates due to a number of cancers in a highly exposed group (which drinks water with a mean arsenic concentration of, say 10mg) is compared with those in the general population. An SMR for bladder cancer of 1.70 in the exposed group would mean that there is 70% more cases of death due to bladder cancer in the cohort than in the reference population (in this case the national population, which is generally considered not to exhibit cumulative exposure to high arsenic levels).

The SMR may well be quoted with an indication of the uncertainty associated with its estimation, such as a confidence interval (CI) or p value, which allows it to be interpreted in terms of statistical significance.

See also

Vulnerability index

Resources

• PAMCOMP Person-Years Analysis and Computation Programm for calculating SMRs

References

Everitt, B.S. (2002) Cambridge Dictionary of Statistics, CUP.

This health-related article is a stub. You can help Wikipedia by expanding it.v · Categories: Epidemiology Biostatistics Medical statistics Statistical ratios Statistical terminology Health stubs Wikimedia Foundation. 2010. Игры ⚽ Нужно сделать НИР? Taipei Guest House Friend Opportunity Look at other dictionaries: standardized mortality ratio — sustandartintas mirtingumo santykis statusas T sritis biomedicinos mokslai santrumpa( os) SMS atitikmenys: angl. standardized mortality ratio ryšiai: susijęs terminas – standartizacija šaltinis Pagrindinės epidemiologijos sąvokos : mokomasis… …   Lithuanian dictionary (lietuvių žodynas) standardized mortality ratio — (SMR) the ratio of the number of observed deaths in a study population to the number of expected deaths in that population. The expected deaths are calculated by classifying the study group by demographic variables such as age, sex, or race;… …   Medical dictionary standardized morbidity ratio — (SMR) a ratio like a standardized mortality ratio except that cases of disease rather than deaths are the observed data …   Medical dictionary standardized mortality rate — noun (medicine) The ratio of observed to expected deaths in a subpopulation (abbrev SMR) • • • Main Entry: ↑standard …   Useful english dictionary proportionate mortality ratio — (PMR) 1. the ratio of the number of deaths from a particular cause to the total number of deaths in the same time period. 2. in occupational epidemiology, the ratio of observed deaths due to a specific cause in an occupational cohort to the… …   Medical dictionary Standardised mortality rate — Standardized mortality ratio (indirect age adjustment) is often used when numbers of deaths for each age specific stratum are not available. It is also used to study mortality in an occupationally exposed population: Do people who work in a… …   Wikipedia ratio — An expression of the relation of one quantity to another ( e.g., of a proportion or rate). SEE ALSO: index (2), quotient. [L. r. (ration ) a reckoning, reason, fr. reor, pp. ratus, to reckon, compute] absolute terminal innervation r. the number… …   Medical dictionary mortality rate — mortality, mortality rate The death rate, usually standardized by age and sex, to facilitate comparisons between areas and social groups. It provides a measure of health risks, improvements in the quality of health care, and the comparative… …   Dictionary of sociology mortality — mortality, mortality rate The death rate, usually standardized by age and sex, to facilitate comparisons between areas and social groups. It provides a measure of health risks, improvements in the quality of health care, and the comparative… …   Dictionary of sociology Смертность Производственная (Occupational Mortality) — отражает численность умерших, а также причины, повлекшие за собой смерть, применительно к различным видам производственной деятельности, социально экономическим группам или социальным классам населения. Так как в некоторых организациях работают… …   Медицинские термины 18+ © Academic, 2000-2024 Contact us: Technical Support, Advertising Dictionaries export, created on PHP, Joomla, Drupal, WordPress, MODx. Mark and share Search through all dictionaries Translate… Search Internet Share the article and excerpts Direct link … Do a right-click on the link above and select “Copy Link”