TABLE 1 Categories of Evidence

Category

Committee to Review the Adverse Consequences of Pertussis and Rubella Vaccines

Vaccine Safety Committee

1

No evidence bearing on causality

No evidence bearing on causality

2

Evidence insufficient to indicate a causal relation

The evidence is inadequate to accept or reject a causal relation

3

Evidence does not indicate a causal relation

The evidence favors rejection of a causal relation

4

Evidence is consistent with a causal relation

The evidence favors acceptance of a causal relation

5

Evidence indicates a causal relation

The evidence establishes a causal relation

Source: Institute of Medicine, 1991, 1994.



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