Identifying and definitional attributes  
Metadata item type:  Glossary Item 

METeOR identifier:  327274 
Registration status:  Health, Standard 01/03/2005 
Definition:  The ratio of the number of events in the population being studied during a certain time period to the estimated population size midway through that time period.

Context:  Population health and health services research: Required to calculate population rates, such as incidence rates, prevalence rates, mortality rates and health service utilisation rates. 
Collection and usage attributes  
Guide for use:  Formula: Where: 
Comments:  Crude rates are generally multiplied by 1,000 or 100,000 to avoid small decimal fractions. It is then called the crude rate per 1,000 or 100,000 population. 
Source and reference attributes  
Origin:  Australian Institute of Health and Welfare 
Reference documents:  Textbooks of epidemiology, demography and biostatistics. The presentation of formulae in this data element is based on the notation used in Armitage P & Berry G 1994. Statistical Methods in Medical Research. Oxford: Blackwell Scientific Publications. See also Agestandardised rate 
Relational attributes  
Related metadata references:  Supersedes Crude rate, version 1, Derived DE, NHDD, NHIMG, Superseded 01/03/2005.pdf (14.2 KB) 
Metadata items which use this glossary item:  Agestandardised rate Health, Standard 01/03/2005 