All are true of standardised moality ratio except
**Core Concept**
The standardized mortality ratio (SMR) is a statistical measure used to compare the actual number of deaths in a population to the expected number of deaths based on a standard population. It is a widely used indicator in epidemiology to assess the mortality rate of a specific population or group.
**Why the Correct Answer is Right**
The SMR is calculated by dividing the observed number of deaths by the expected number of deaths in the standard population. This ratio is then expressed as a percentage or a proportion. The SMR is a useful tool for identifying populations with higher or lower mortality rates than expected, which can help in identifying potential health disparities or areas for public health intervention.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is not provided, but the explanation will proceed with the next options.
* **Option B:** This option is also not provided, but the explanation will proceed with the next options.
* **Option C:** This option is not provided, but the explanation will proceed with the next options.
* **Option D:** This option is also not provided, but the explanation will proceed with the next options.
**Clinical Pearl / High-Yield Fact**
The SMR is sensitive to the choice of standard population, and it is essential to select a standard population that is comparable to the study population. Additionally, the SMR should be interpreted in conjunction with other epidemiological measures, such as the age-standardized mortality rate, to provide a more comprehensive understanding of mortality patterns.
**Correct Answer:**
Please provide the correct answer and options for a complete explanation.