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WHO Age Group Classification and Standardization
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- Basic Concepts
- Age-standardized rates show hypothetical rates with same age distribution as standard population
- Population is divided into three age groups: children, working-age, elderly
- Standardized rates are weighted averages from standard population
- Calculation and Types
- Standardized rate = observed deaths / expected deaths
- Age categories include chronological, appearance, biological, and mental age
- WHO World Standard population has fewer children and more adults over 70
- Historical Development
- Neison introduced direct standardization method in 1844
- Standard population changed every 1980
- New WHO standard extends terminal age group to 100 years
- Standard Selection
- Choice between standard and older standard is arbitrary
- Standard should ideally be changed to match current population age