NIM with specific study IM; epidemiological & statistical only: not for blood samples, soil samples, water samples, air samples, etc.
Scope Note
Studies in which a number of subjects are selected from all subjects in a defined population. Conclusions based on sample results may be attributed only to the population sampled.
Studies in which a number of subjects are selected from all subjects in a defined population. Conclusions based on sample results may be attributed only to the population sampled.
