What is standard population?

Standard populations, often referred to as standard millions, are the age distributions used as weights to create age-adjusted statistics. For the 5-year age groups, the single year of age populations are summarized from the five single-year of age populations.

How is SMR calculated in epidemiology?

Standardized Mortality Ratio (SMR) = (Observed Deaths / Expected Deaths)
SMR = (481 / 430.98) = 1.12.
Excess Deaths = (Observed Deaths – Expected Deaths)
Excess Deaths = (481 – 430.98 = 50.02 or 4.5 deaths per year (50.02 / 11)

What is standard death rate?

The standardised death rate, abbreviated as SDR, is the death rate of a population adjusted to a standard age distribution. It is calculated as a weighted average of the age-specific death rates of a given population; the weights are the age distribution of that population.

How do you calculate standard death rate?

Add all the age- and sex- specific expected deaths to get the expected number of deaths for the whole study population. Finally, divide the observed number of deaths by the expected number of deaths. This gives the standardised mortality ratio.

How is standard population calculated?

Age-specific rate, 0 to 39 years. = 1,345 (number of deaths) ÷ 17,068,876 (total population) × 100,000. = 7.9 cancer deaths per 100,000 population. We then multiply each of the age-specific rates by the proportion of the 1991 population belonging to the particular age group (called the standard population weight).

What is age standardized rate?

Definition: The age-standardized mortality rate is a weighted average of the age-specific mortality rates per 100 000 persons, where the weights are the proportions of persons in the corresponding age groups of the WHO standard population.

What is age Standardised rate?

A directly age-standardised rate is defined as the weighted average of event rates, with the weights being equal to the proportion of people in each age group in a chosen standard population. The age-standardised rate is usually expressed per 1,000 or 100,000 population.

How is the standardized mortality ratio ( SMR ) calculated?

Standardized Mortality Ratio (SMR) is a ratio between the observed number of deaths in an study population and the number of deaths would be expected, based on the age- and sex-specific rates in a standard population and the population size of the study population by the same age/sex groups.

How is the SMR expressed as a percentage?

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.

How is the standard error of SMR calculated?

Standard error of SMR = (square root of observed deaths) / number of expected deaths If the 95% confidence intervals do not cross 1.0 then the SMR is significant.

When to use SMR and indirectly standardized rates?

A closely related construct, indirectly standardized rates, is also described in this Web page. The SMR is used to compare the mortality risk of an study population to that of a standard population.

What is standard population?