Dose-response in epidemiology--age and time aspects.

Area of Science:

• Epidemiology
• Occupational Health
• Risk Assessment

Background:

• Dose-response relationships are fundamental in epidemiology.
• Understanding how age and time influence these relationships is crucial for accurate risk assessment.

Purpose of the Study:

• To analyze the impact of age and time factors on dose-response relationships.
• To determine the relative importance of "age at exposure" versus "time since exposure" in occupational epidemiology.

Main Methods:

• Review of epidemiological studies examining dose-response relationships.
• Analysis of risk estimation parameters (excess risk, relative risk).

Main Results:

• The influence of age and time on dose-response varies by risk parameter.
• Excess risk may increase with age at exposure, while relative risk may decrease.
• "Time since onset of exposure" and "time since last exposure" are key factors.

Conclusions:

• "Time since exposure" is generally more important than "age at exposure" in occupational epidemiology.
• Accurate risk estimation requires careful consideration of temporal factors.
• The choice of risk parameter influences the interpretation of age effects.