All are true of standardised moality ratio except ?
**Core Concept**
The standardized mortality ratio (SMR) is a statistical measure used to compare the number of deaths in a population to the expected number of deaths based on a standard population. It is used to evaluate the mortality rate of a particular group or population.
**Why the Correct Answer is Right**
The SMR is calculated by dividing the actual number of deaths by the expected number of deaths in a standard population, and then multiplying by 100 to express it as a percentage. This allows for the comparison of mortality rates between different populations and over time. The SMR takes into account the age and sex distribution of the population, as well as other demographic factors.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is not provided.
**Option B:** This option is not provided.
**Option C:** This option is not provided.
**Option D:** This option is not provided.
**Clinical Pearl / High-Yield Fact**
The SMR is a useful tool for evaluating the quality of healthcare in a particular region or institution. A high SMR may indicate that a population is experiencing a higher-than-expected mortality rate, which could be due to various factors such as inadequate healthcare resources, poor healthcare practices, or underlying social determinants of health.
**Correct Answer: None of the above.**